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camcontrolCAM

CAMCONTROL(8) System Manager's Manual CAMCONTROL(8)

NAME

camcontrolCAM control program

SYNOPSIS

camcontrol command⟩ [device id] [generic args] [command args]

camcontrol devlist [-b] [-v]

camcontrol periphlist [device id] [-n dev_name] [-u unit_number]

camcontrol tur [device id] [generic args]

camcontrol inquiry [device id] [generic args] [-D] [-S] [-R]

camcontrol identify [device id] [generic args] [-v]

camcontrol reportluns [device id] [generic args] [-c] [-l] [-r reporttype]

camcontrol readcap [device id] [generic args] [-b] [-h] [-H] [-N] [-q] [-s]

camcontrol start [device id] [generic args]

camcontrol stop [device id] [generic args]

camcontrol load [device id] [generic args]

camcontrol eject [device id] [generic args]

camcontrol rescan ⟨all | bus[:target:lun]⟩

camcontrol reset ⟨all | bus[:target:lun]⟩

camcontrol defects [device id] [generic args] ⟨-f format⟩ [-P] [-G] [-q] [-s] [-S offset] [-X]

camcontrol modepage [device id] [generic args] ⟨-m page | -l⟩ [-P pgctl] [-b | -e] [-d]

camcontrol cmd [device id] [generic args] ⟨-a cmd [args]⟩ ⟨-c cmd [args]⟩ [-d] [-f] [-i len fmt] [-o len fmt [args]] [-r fmt]

camcontrol smpcmd [device id] [generic args] ⟨-r len fmt [args]⟩ ⟨-R len fmt [args]⟩

camcontrol smprg [device id] [generic args] [-l]

camcontrol smppc [device id] [generic args] ⟨-p phy⟩ [-l] [-o operation] [-d name] [-m rate] [-M rate] [-T pp_timeout] [-a enable|disable] [-A enable|disable] [-s enable|disable] [-S enable|disable]

camcontrol smpphylist [device id] [generic args] [-l] [-q]

camcontrol smpmaninfo [device id] [generic args] [-l]

camcontrol debug [-I] [-P] [-T] [-S] [-X] [-c] [-p] ⟨all|off|bus[:target[:lun]]⟩

camcontrol tags [device id] [generic args] [-N tags] [-q] [-v]

camcontrol negotiate [device id] [generic args] [-c] [-D enable|disable] [-M mode] [-O offset] [-q] [-R syncrate] [-T enable|disable] [-U] [-W bus_width] [-v]

camcontrol format [device id] [generic args] [-q] [-r] [-w] [-y]

camcontrol sanitize [device id] [generic args] ⟨-a overwrite | block | crypto | exitfailure⟩ [-c passes] [-I] [-P pattern] [-q] [-U] [-r] [-w] [-y]

camcontrol idle [device id] [generic args] [-t time]

camcontrol standby [device id] [generic args] [-t time]

camcontrol sleep [device id] [generic args]

camcontrol apm [device id] [generic args] [-l level]

camcontrol aam [device id] [generic args] [-l level]

camcontrol fwdownload [device id] [generic args] ⟨-f fw_image⟩ [-q] [-s] [-y]

camcontrol security [device id] [generic args] [-d pwd] [-e pwd] [-f] [-h pwd] [-k pwd] [-l high|maximum] [-q] [-s pwd] [-T timeout] [-U user|master] [-y]

camcontrol hpa [device id] [generic args] [-f] [-l] [-P] [-p pwd] [-q] [-s max_sectors] [-U pwd] [-y]

camcontrol persist [device id] [generic args] ⟨-i action | -o action⟩ [-a] [-I trans_id] [-k key] [-K sa_key] [-p] [-R rel_tgt_port] [-s scope] [-S] [-T res_type] [-U]

camcontrol attrib [device id] [generic args] ⟨-r action | -w attrib⟩ [-a attr_num] [-c] [-e elem_addr] [-F form1,form2] [-p part] [-s start_addr] [-T elem_type] [-V lv_num]

camcontrol opcodes [device id] [generic args] [-o opcode] [-s service_action] [-N] [-T]

camcontrol help

DESCRIPTION

The camcontrol utility is designed to provide a way for users to access and control the FreeBSD CAM subsystem.
The camcontrol utility can cause a loss of data and/or system crashes if used improperly. Even expert users are encouraged to exercise caution when using this command. Novice users should stay away from this utility.
The camcontrol utility has a number of primary functions, many of which support an optional device identifier. A device identifier can take one of three forms:
deviceUNIT
Specify a device name and unit number combination, like "da5" or "cd3".
bus:target
Specify a bus number and target id. The bus number can be determined from the output of “camcontrol devlist”. The lun defaults to 0.
bus:target:lun
Specify the bus, target and lun for a device. (e.g. 1:2:0)
The device identifier, if it is specified, must come immediately after the function name, and before any generic or function-specific arguments. Note that the -n and -u arguments described below will override any device name or unit number specified beforehand. The -n and -u arguments will not override a specified bus:target or bus:target:lun, however.
Most of the camcontrol primary functions support these generic arguments:
-C count
SCSI command retry count. In order for this to work, error recovery (-E) must be turned on.
-E
Instruct the kernel to perform generic SCSI error recovery for the given command. This is needed in order for the retry count (-C) to be honored. Other than retrying commands, the generic error recovery in the code will generally attempt to spin up drives that are not spinning. It may take some other actions, depending upon the sense code returned from the command.
-n dev_name
Specify the device type to operate on, e.g. "da", "cd".
-t timeout
SCSI command timeout in seconds. This overrides the default timeout for any given command.
-u unit_number
Specify the device unit number, e.g. "1", "5".
-v
Be verbose, print out sense information for failed SCSI commands.
Primary command functions:
devlist
List all physical devices (logical units) attached to the CAM subsystem. This also includes a list of peripheral drivers attached to each device. With the -v argument, SCSI bus number, adapter name and unit numbers are printed as well. On the other hand, with the -b argument, only the bus adapter, and unit information will be printed, and device information will be omitted.
periphlist
List all peripheral drivers attached to a given physical device (logical unit).
tur
Send the SCSI test unit ready (0x00) command to the given device. The camcontrol utility will report whether the device is ready or not.
inquiry
Send a SCSI inquiry command (0x12) to a device. By default, camcontrol will print out the standard inquiry data, device serial number, and transfer rate information. The user can specify that only certain types of inquiry data be printed:
-D
Get the standard inquiry data.
-S
Print out the serial number. If this flag is the only one specified, camcontrol will not print out "Serial Number" before the value returned by the drive. This is to aid in script writing.
-R
Print out transfer rate information.
identify
Send a ATA identify command (0xec) to a device.
reportluns
Send the SCSI REPORT LUNS (0xA0) command to the given device. By default, camcontrol will print out the list of logical units (LUNs) supported by the target device. There are a couple of options to modify the output:
-c
Just print out a count of LUNs, not the actual LUN numbers.
-l
Just print out the LUNs, and do not print out the count.
-r reporttype
Specify the type of report to request from the target:
default
Return the default report. This is the camcontrol default. Most targets will support this report if they support the REPORT LUNS command.
wellknown
Return only well known LUNs.
all
Return all available LUNs.
camcontrol will try to print out LUN numbers in a reasonable format. It can understand the peripheral, flat, LUN and extended LUN formats.
readcap
Send the SCSI READ CAPACITY command to the given device and display the results. If the device is larger than 2TB, the SCSI READ CAPACITY (16) service action will be sent to obtain the full size of the device. By default, camcontrol will print out the last logical block of the device, and the blocksize of the device in bytes. To modify the output format, use the following options:
-b
Just print out the blocksize, not the last block or device size. This cannot be used with -N or -s.
-h
Print out the device size in human readable (base 2, 1K == 1024) format. This implies -N and cannot be used with -q or -b.
-H
Print out the device size in human readable (base 10, 1K == 1000) format.
-N
Print out the number of blocks in the device instead of the last logical block.
-q
Quiet, print out the numbers only (separated by a comma if -b or -s are not specified).
-s
Print out the last logical block or the size of the device only, and omit the blocksize.
start
Send the SCSI Start/Stop Unit (0x1B) command to the given device with the start bit set.
stop
Send the SCSI Start/Stop Unit (0x1B) command to the given device with the start bit cleared.
load
Send the SCSI Start/Stop Unit (0x1B) command to the given device with the start bit set and the load/eject bit set.
eject
Send the SCSI Start/Stop Unit (0x1B) command to the given device with the start bit cleared and the load/eject bit set.
rescan
Tell the kernel to scan all busses in the system (with the all argument), the given bus (XPT_SCAN_BUS), or bus:target:lun (XPT_SCAN_LUN) for new devices or devices that have gone away. The user may specify a scan of all busses, a single bus, or a lun. Scanning all luns on a target is not supported.
reset
Tell the kernel to reset all busses in the system (with the all argument) or the given bus (XPT_RESET_BUS) by issuing a SCSI bus reset for that bus, or to reset the given bus:target:lun (XPT_RESET_DEV), typically by issuing a BUS DEVICE RESET message after connecting to that device. Note that this can have a destructive impact on the system.
defects
Send the SCSI READ DEFECT DATA (10) command (0x37) or the SCSI READ DEFECT DATA (12) command (0xB7) to the given device, and print out any combination of: the total number of defects, the primary defect list (PLIST), and the grown defect list (GLIST).
-f format
Specify the requested format of the defect list. The format argument is required. Most drives support the physical sector format. Some drives support the logical block format. Many drives, if they do not support the requested format, return the data in an alternate format, along with sense information indicating that the requested data format is not supported. The camcontrol utility attempts to detect this, and print out whatever format the drive returns. If the drive uses a non-standard sense code to report that it does not support the requested format, camcontrol will probably see the error as a failure to complete the request.
The format options are:
block
Print out the list as logical blocks. This is limited to 32-bit block sizes, and isn't supported by many modern drives.
longblock
Print out the list as logical blocks. This option uses a 64-bit block size.
bfi
Print out the list in bytes from index format.
extbfi
Print out the list in extended bytes from index format. The extended format allows for ranges of blocks to be printed.
phys
Print out the list in physical sector format. Most drives support this format.
extphys
Print out the list in extended physical sector format. The extended format allows for ranges of blocks to be printed.
-G
Print out the grown defect list. This is a list of bad blocks that have been remapped since the disk left the factory.
-P
Print out the primary defect list. This is the list of defects that were present in the factory.
-q
When printing status information with -s, only print the number of defects.
-s
Just print the number of defects, not the list of defects.
-S offset
Specify the starting offset into the defect list. This implies using the SCSI READ DEFECT DATA (12) command, as the 10 byte version of the command doesn't support the address descriptor index field. Not all drives support the 12 byte command, and some drives that support the 12 byte command don't support the address descriptor index field.
-X
Print out defects in hexadecimal (base 16) form instead of base 10 form.
If neither -P nor -G is specified, camcontrol will print out the number of defects given in the READ DEFECT DATA header returned from the drive. Some drives will report 0 defects if neither the primary or grown defect lists are requested.
modepage
Allows the user to display and optionally edit a SCSI mode page. The mode page formats are located in /usr/share/misc/scsi_modes. This can be overridden by specifying a different file in the SCSI_MODES environment variable. The modepage command takes several arguments:
-d
Disable block descriptors for mode sense.
-b
Displays mode page data in binary format.
-e
This flag allows the user to edit values in the mode page. The user may either edit mode page values with the text editor pointed to by his EDITOR environment variable, or supply mode page values via standard input, using the same format that camcontrol uses to display mode page values. The editor will be invoked if camcontrol detects that standard input is terminal.
-l
Lists all available mode pages.
-m mode_page
This specifies the number of the mode page the user would like to view and/or edit. This argument is mandatory unless -l is specified.
-P pgctl
This allows the user to specify the page control field. Possible values are:
0
Current values
1
Changeable values
2
Default values
3
Saved values
cmd
Allows the user to send an arbitrary ATA or SCSI CDB to any device. The cmd function requires the -c argument to specify SCSI CDB or the -a argument to specify ATA Command Block registers values. Other arguments are optional, depending on the command type. The command and data specification syntax is documented in cam_cdbparse(3). NOTE: If the CDB specified causes data to be transferred to or from the SCSI device in question, you MUST specify either -i or -o.
-a cmd [args]
This specifies the content of 12 ATA Command Block registers (command, features, lba_low, lba_mid, lba_high, device, lba_low_exp, lba_mid_exp. lba_high_exp, features_exp, sector_count, sector_count_exp).
-c cmd [args]
This specifies the SCSI CDB. SCSI CDBs may be 6, 10, 12 or 16 bytes.
-d
Specifies DMA protocol to be used for ATA command.
-f
Specifies FPDMA (NCQ) protocol to be used for ATA command.
-i len fmt
This specifies the amount of data to read, and how it should be displayed. If the format is ‘-’, len bytes of data will be read from the device and written to standard output.
-o len fmt [args]
This specifies the amount of data to be written to a device, and the data that is to be written. If the format is ‘-’, len bytes of data will be read from standard input and written to the device.
-r fmt
This specifies that 11 result ATA Command Block registers should be displayed (status, error, lba_low, lba_mid, lba_high, device, lba_low_exp, lba_mid_exp, lba_high_exp, sector_count, sector_count_exp), and how. If the format is ‘-’, 11 result registers will be written to standard output in hex.
smpcmd
Allows the user to send an arbitrary Serial Management Protocol (SMP) command to a device. The smpcmd function requires the -r argument to specify the SMP request to be sent, and the -R argument to specify the format of the SMP response. The syntax for the SMP request and response arguments is documented in cam_cdbparse(3).
Note that SAS adapters that support SMP passthrough (at least the currently known adapters) do not accept CRC bytes from the user in the request and do not pass CRC bytes back to the user in the response. Therefore users should not include the CRC bytes in the length of the request and not expect CRC bytes to be returned in the response.
-r len fmt [args]
This specifies the size of the SMP request, without the CRC bytes, and the SMP request format. If the format is ‘-’, len bytes of data will be read from standard input and written as the SMP request.
-R len fmt [args]
This specifies the size of the buffer allocated for the SMP response, and the SMP response format. If the format is ‘-’, len bytes of data will be allocated for the response and the response will be written to standard output.
smprg
Allows the user to send the Serial Management Protocol (SMP) Report General command to a device. camcontrol will display the data returned by the Report General command. If the SMP target supports the long response format, the additional data will be requested and displayed automatically.
-l
Request the long response format only. Not all SMP targets support the long response format. This option causes camcontrol to skip sending the initial report general request without the long bit set and only issue a report general request with the long bit set.
smppc
Allows the user to issue the Serial Management Protocol (SMP) PHY Control command to a device. This function should be used with some caution, as it can render devices inaccessible, and could potentially cause data corruption as well. The -p argument is required to specify the PHY to operate on.
-p phy
Specify the PHY to operate on. This argument is required.
-l
Request the long request/response format. Not all SMP targets support the long response format. For the PHY Control command, this currently only affects whether the request length is set to a value other than 0.
-o operation
Specify a PHY control operation. Only one -o operation may be specified. The operation may be specified numerically (in decimal, hexadecimal, or octal) or one of the following operation names may be specified:
nop
No operation. It is not necessary to specify this argument.
linkreset
Send the LINK RESET command to the phy.
hardreset
Send the HARD RESET command to the phy.
disable
Send the DISABLE command to the phy. Note that the LINK RESET or HARD RESET commands should re-enable the phy.
clearerrlog
Send the CLEAR ERROR LOG command. This clears the error log counters for the specified phy.
clearaffiliation
Send the CLEAR AFFILIATION command. This clears the affiliation from the STP initiator port with the same SAS address as the SMP initiator that requests the clear operation.
sataportsel
Send the TRANSMIT SATA PORT SELECTION SIGNAL command to the phy. This will cause a SATA port selector to use the given phy as its active phy and make the other phy inactive.
clearitnl
Send the CLEAR STP I_T NEXUS LOSS command to the PHY.
setdevname
Send the SET ATTACHED DEVICE NAME command to the PHY. This requires the -d argument to specify the device name.
-d name
Specify the attached device name. This option is needed with the -o setdevname phy operation. The name is a 64-bit number, and can be specified in decimal, hexadecimal or octal format.
-m rate
Set the minimum physical link rate for the phy. This is a numeric argument. Currently known link rates are:
0x0
Do not change current value.
0x8
1.5 Gbps
0x9
3 Gbps
0xa
6 Gbps
Other values may be specified for newer physical link rates.
-M rate
Set the maximum physical link rate for the phy. This is a numeric argument. See the -m argument description for known link rate arguments.
-T pp_timeout
Set the partial pathway timeout value, in microseconds. See the ANSI SAS Protocol Layer (SPL) specification for more information on this field.
-a enable|disable
Enable or disable SATA slumber phy power conditions.
-A enable|disable
Enable or disable SATA partial power conditions.
-s enable|disable
Enable or disable SAS slumber phy power conditions.
-S enable|disable
Enable or disable SAS partial phy power conditions.
smpphylist
List phys attached to a SAS expander, the address of the end device attached to the phy, and the inquiry data for that device and peripheral devices attached to that device. The inquiry data and peripheral devices are displayed if available.
-l
Turn on the long response format for the underlying SMP commands used for this command.
-q
Only print out phys that are attached to a device in the CAM EDT (Existing Device Table).
smpmaninfo
Send the SMP Report Manufacturer Information command to the device and display the response.
-l
Turn on the long response format for the underlying SMP commands used for this command.
debug
Turn on CAM debugging printfs in the kernel. This requires options CAMDEBUG in your kernel config file. WARNING: enabling debugging printfs currently causes an EXTREME number of kernel printfs. You may have difficulty turning off the debugging printfs once they start, since the kernel will be busy printing messages and unable to service other requests quickly. The debug function takes a number of arguments:
-I
Enable CAM_DEBUG_INFO printfs.
-P
Enable CAM_DEBUG_PERIPH printfs.
-T
Enable CAM_DEBUG_TRACE printfs.
-S
Enable CAM_DEBUG_SUBTRACE printfs.
-X
Enable CAM_DEBUG_XPT printfs.
-c
Enable CAM_DEBUG_CDB printfs. This will cause the kernel to print out the SCSI CDBs sent to the specified device(s).
-p
Enable CAM_DEBUG_PROBE printfs.
all
Enable debugging for all devices.
off
Turn off debugging for all devices
bus[:target[:lun]]
Turn on debugging for the given bus, target or lun. If the lun or target and lun are not specified, they are wildcarded. (i.e., just specifying a bus turns on debugging printfs for all devices on that bus.)
tags
Show or set the number of "tagged openings" or simultaneous transactions we attempt to queue to a particular device. By default, the tags command, with no command-specific arguments (i.e., only generic arguments) prints out the "soft" maximum number of transactions that can be queued to the device in question. For more detailed information, use the -v argument described below.
-N tags
Set the number of tags for the given device. This must be between the minimum and maximum number set in the kernel quirk table. The default for most devices that support tagged queueing is a minimum of 2 and a maximum of 255. The minimum and maximum values for a given device may be determined by using the -v switch. The meaning of the -v switch for this camcontrol subcommand is described below.
-q
Be quiet, and do not report the number of tags. This is generally used when setting the number of tags.
-v
The verbose flag has special functionality for the tags argument. It causes camcontrol to print out the tagged queueing related fields of the XPT_GDEV_TYPE CCB:
dev_openings
This is the amount of capacity for transactions queued to a given device.
dev_active
This is the number of transactions currently queued to a device.
devq_openings
This is the kernel queue space for transactions. This count usually mirrors dev_openings except during error recovery operations when the device queue is frozen (device is not allowed to receive commands), the number of dev_openings is reduced, or transaction replay is occurring.
devq_queued
This is the number of transactions waiting in the kernel queue for capacity on the device. This number is usually zero unless error recovery is in progress.
held
The held count is the number of CCBs held by peripheral drivers that have either just been completed or are about to be released to the transport layer for service by a device. Held CCBs reserve capacity on a given device.
mintags
This is the current "hard" minimum number of transactions that can be queued to a device at once. The dev_openings value above cannot go below this number. The default value for mintags is 2, although it may be set higher or lower for various devices.
maxtags
This is the "hard" maximum number of transactions that can be queued to a device at one time. The dev_openings value cannot go above this number. The default value for maxtags is 255, although it may be set higher or lower for various devices.
negotiate
Show or negotiate various communication parameters. Some controllers may not support setting or changing some of these values. For instance, the Adaptec 174x controllers do not support changing a device's sync rate or offset. The camcontrol utility will not attempt to set the parameter if the controller indicates that it does not support setting the parameter. To find out what the controller supports, use the -v flag. The meaning of the -v flag for the negotiate command is described below. Also, some controller drivers do not support setting negotiation parameters, even if the underlying controller supports negotiation changes. Some controllers, such as the Advansys wide controllers, support enabling and disabling synchronous negotiation for a device, but do not support setting the synchronous negotiation rate.
-a
Attempt to make the negotiation settings take effect immediately by sending a Test Unit Ready command to the device.
-c
Show or set current negotiation settings. This is the default.
-D enable|disable
Enable or disable disconnection.
-M mode
Set ATA mode.
-O offset
Set the command delay offset.
-q
Be quiet, do not print anything. This is generally useful when you want to set a parameter, but do not want any status information.
-R syncrate
Change the synchronization rate for a device. The sync rate is a floating point value specified in MHz. So, for instance, ‘20.000’ is a legal value, as is ‘20’.
-T enable|disable
Enable or disable tagged queueing for a device.
-U
Show or set user negotiation settings. The default is to show or set current negotiation settings.
-v
The verbose switch has special meaning for the negotiate subcommand. It causes camcontrol to print out the contents of a Path Inquiry (XPT_PATH_INQ) CCB sent to the controller driver.
-W bus_width
Specify the bus width to negotiate with a device. The bus width is specified in bits. The only useful values to specify are 8, 16, and 32 bits. The controller must support the bus width in question in order for the setting to take effect.
In general, sync rate and offset settings will not take effect for a device until a command has been sent to the device. The -a switch above will automatically send a Test Unit Ready to the device so negotiation parameters will take effect.
format
Issue the SCSI FORMAT UNIT command to the named device.
WARNING! WARNING! WARNING!
Low level formatting a disk will destroy ALL data on the disk. Use extreme caution when issuing this command. Many users low-level format disks that do not really need to be low-level formatted. There are relatively few scenarios that call for low-level formatting a disk. One reason for low-level formatting a disk is to initialize the disk after changing its physical sector size. Another reason for low-level formatting a disk is to revive the disk if you are getting "medium format corrupted" errors from the disk in response to read and write requests.
Some disks take longer than others to format. Users should specify a timeout long enough to allow the format to complete. The default format timeout is 3 hours, which should be long enough for most disks. Some hard disks will complete a format operation in a very short period of time (on the order of 5 minutes or less). This is often because the drive does not really support the FORMAT UNIT command -- it just accepts the command, waits a few minutes and then returns it.
The ‘format’ subcommand takes several arguments that modify its default behavior. The -q and -y arguments can be useful for scripts.
-q
Be quiet, do not print any status messages. This option will not disable the questions, however. To disable questions, use the -y argument, below.
-r
Run in “report only” mode. This will report status on a format that is already running on the drive.
-w
Issue a non-immediate format command. By default, camcontrol issues the FORMAT UNIT command with the immediate bit set. This tells the device to immediately return the format command, before the format has actually completed. Then, camcontrol gathers SCSI sense information from the device every second to determine how far along in the format process it is. If the -w argument is specified, camcontrol will issue a non-immediate format command, and will be unable to print any information to let the user know what percentage of the disk has been formatted.
-y
Do not ask any questions. By default, camcontrol will ask the user if he/she really wants to format the disk in question, and also if the default format command timeout is acceptable. The user will not be asked about the timeout if a timeout is specified on the command line.
sanitize
Issue the SCSI SANITIZE command to the named device.
WARNING! WARNING! WARNING!
ALL data in the cache and on the disk will be destroyed or made inaccessible. Recovery of the data is not possible. Use extreme caution when issuing this command.
The ‘sanitize’ subcommand takes several arguments that modify its default behavior. The -q and -y arguments can be useful for scripts.
-a operation
Specify the sanitize operation to perform.
overwrite
Perform an overwrite operation by writing a user supplied data pattern to the device one or more times. The pattern is given by the -P argument. The number of times is given by the -c argument.
block
Perform a block erase operation. All the device's blocks are set to a vendor defined value, typically zero.
crypto
Perform a cryptographic erase operation. The encryption keys are changed to prevent the decryption of the data.
exitfailure
Exits a previously failed sanitize operation. A failed sanitize operation can only be exited if it was run in the unrestricted completion mode, as provided by the -U argument.
-c passes
The number of passes when performing an ‘overwrite’ operation. Valid values are between 1 and 31. The default is 1.
-I
When performing an ‘overwrite’ operation, the pattern is inverted between consecutive passes.
-P pattern
Path to the file containing the pattern to use when performing an ‘overwrite’ operation. The pattern is repeated as needed to fill each block.
-q
Be quiet, do not print any status messages. This option will not disable the questions, however. To disable questions, use the -y argument, below.
-U
Perform the sanitize in the unrestricted completion mode. If the operation fails, it can later be exited with the ‘exitfailure’ operation.
-r
Run in “report only” mode. This will report status on a sanitize that is already running on the drive.
-w
Issue a non-immediate sanitize command. By default, camcontrol issues the SANITIZE command with the immediate bit set. This tells the device to immediately return the sanitize command, before the sanitize has actually completed. Then, camcontrol gathers SCSI sense information from the device every second to determine how far along in the sanitize process it is. If the -w argument is specified, camcontrol will issue a non-immediate sanitize command, and will be unable to print any information to let the user know what percentage of the disk has been sanitized.
-y
Do not ask any questions. By default, camcontrol will ask the user if he/she really wants to sanitize the disk in question, and also if the default sanitize command timeout is acceptable. The user will not be asked about the timeout if a timeout is specified on the command line.
idle
Put ATA device into IDLE state. Optional parameter (-t) specifies automatic standby timer value in seconds. Value 0 disables timer.
standby
Put ATA device into STANDBY state. Optional parameter (-t) specifies automatic standby timer value in seconds. Value 0 disables timer.
sleep
Put ATA device into SLEEP state. Note that the only way get device out of this state may be reset.
apm
It optional parameter (-l) specified, enables and sets advanced power management level, where 1 -- minimum power, 127 -- maximum performance with standby, 128 -- minimum power without standby, 254 -- maximum performance. If not specified -- APM is disabled.
aam
It optional parameter (-l) specified, enables and sets automatic acoustic management level, where 1 -- minimum noise, 254 -- maximum performance. If not specified -- AAM is disabled.
security
Update or report security settings, using an ATA identify command (0xec). By default, camcontrol will print out the security support and associated settings of the device. The security command takes several arguments:
-d pwd
Disable device security using the given password for the selected user according to the devices configured security level.
-e pwd
Erase the device using the given password for the selected user.
WARNING! WARNING! WARNING!
Issuing a secure erase will ERASE ALL user data on the device and may take several hours to complete.
When this command is used against an SSD drive all its cells will be marked as empty, restoring it to factory default write performance. For SSD's this action usually takes just a few seconds.
-f
Freeze the security configuration of the specified device.
After command completion any other commands that update the device lock mode shall be command aborted. Frozen mode is disabled by power-off or hardware reset.
-h pwd
Enhanced erase the device using the given password for the selected user.
WARNING! WARNING! WARNING!
Issuing an enhanced secure erase will ERASE ALL user data on the device and may take several hours to complete.
An enhanced erase writes predetermined data patterns to all user data areas, all previously written user data shall be overwritten, including sectors that are no longer in use due to reallocation.
-k pwd
Unlock the device using the given password for the selected user according to the devices configured security level.
-l high|maximum
Specifies which security level to set when issuing a -s pwd command. The security level determines device behavior when the master password is used to unlock the device. When the security level is set to high the device requires the unlock command and the master password to unlock. When the security level is set to maximum the device requires a secure erase with the master password to unlock.
This option must be used in conjunction with one of the security action commands.
Defaults to high
-q
Be quiet, do not print any status messages. This option will not disable the questions, however. To disable questions, use the -y argument, below.
-s pwd
Password the device (enable security) using the given password for the selected user. This option can be combined with other options such as -e pwd
A master password may be set in a addition to the user password. The purpose of the master password is to allow an administrator to establish a password that is kept secret from the user, and which may be used to unlock the device if the user password is lost.
Note: Setting the master password does not enable device security.
If the master password is set and the drive supports a Master Revision Code feature the Master Password Revision Code will be decremented.
-T timeout
Overrides the default timeout, specified in seconds, used for both -e and -h this is useful if your system has problems processing long timeouts correctly.
Usually the timeout is calculated from the information stored on the drive if present, otherwise it defaults to 2 hours.
-U user|master
Specifies which user to set / use for the running action command, valid values are user or master and defaults to master if not set.
This option must be used in conjunction with one of the security action commands.
Defaults to master
-y
Confirm yes to dangerous options such as -e without prompting for confirmation.
If the password specified for any action commands does not match the configured password for the specified user the command will fail.
The password in all cases is limited to 32 characters, longer passwords will fail.
hpa
Update or report Host Protected Area details. By default camcontrol will print out the HPA support and associated settings of the device. The hpa command takes several optional arguments:
-f
Freeze the HPA configuration of the specified device.
After command completion any other commands that update the HPA configuration shall be command aborted. Frozen mode is disabled by power-off or hardware reset.
-l
Lock the HPA configuration of the device until a successful call to unlock or the next power-on reset occurs.
-P
Make the HPA max sectors persist across power-on reset or a hardware reset. This must be used in combination with -s max_sectors
-p pwd
Set the HPA configuration password required for unlock calls.
-q
Be quiet, do not print any status messages. This option will not disable the questions. To disable questions, use the -y argument, below.
-s max_sectors
Configures the maximum user accessible sectors of the device. This will change the number of sectors the device reports.
WARNING! WARNING! WARNING!
Changing the max sectors of a device using this option will make the data on the device beyond the specified value inaccessible.
Only one successful -s max_sectors call can be made without a power-on reset or a hardware reset of the device.
-U pwd
Unlock the HPA configuration of the specified device using the given password. If the password specified does not match the password configured via -p pwd the command will fail.
After 5 failed unlock calls, due to password miss-match, the device will refuse additional unlock calls until after a power-on reset.
-y
Confirm yes to dangerous options such as -e without prompting for confirmation
The password for all HPA commands is limited to 32 characters, longer passwords will fail.
fwdownload
Program firmware of the named SCSI or ATA device using the image file provided.
If the device is a SCSI device and it provides a recommended timeout for the WRITE BUFFER command (see the camcontrol opcodes subcommand), that timeout will be used for the firmware download. The drive-recommended timeout value may be overridden on the command line with the -t option.
Current list of supported vendors for SCSI/SAS drives:
HGST
Tested with 4TB SAS drives, model number HUS724040ALS640.
HITACHI
 
HP
 
IBM
Tested with LTO-5 (ULTRIUM-HH5) and LTO-6 (ULTRIUM-HH6) tape drives. There is a separate table entry for hard drives, because the update method for hard drives is different than the method for tape drives.
PLEXTOR
 
QUALSTAR
 
QUANTUM
 
SAMSUNG
Tested with SM1625 SSDs.
SEAGATE
Tested with Constellation ES (ST32000444SS), ES.2 (ST33000651SS) and ES.3 (ST1000NM0023) drives.
SmrtStor
Tested with 400GB Optimus SSDs (TXA2D20400GA6001).
WARNING! WARNING! WARNING!
Little testing has been done to make sure that different device models from each vendor work correctly with the fwdownload command. A vendor name appearing in the supported list means only that firmware of at least one device type from that vendor has successfully been programmed with the fwdownload command. Extra caution should be taken when using this command since there is no guarantee it will not break a device from the listed vendors. Ensure that you have a recent backup of the data on the device before performing a firmware update.
Note that unknown SCSI protocol devices will not be programmed, since there is little chance of the firmware download succeeding.
camcontrol will currently attempt a firmware download to any ATA or SATA device, since the standard ATA DOWNLOAD MICROCODE command may work. Firmware downloads to ATA and SATA devices are supported for devices connected to standard ATA and SATA controllers, and devices connected to SAS controllers with SCSI to ATA translation capability. In the latter case, camcontrol uses the SCSI ATA PASS-THROUGH command to send the ATA DOWNLOAD MICROCODE command to the drive. Some SCSI to ATA translation implementations don't work fully when translating SCSI WRITE BUFFER commands to ATA DOWNLOAD MICROCODE commands, but do support ATA passthrough well enough to do a firmware download.
-f fw_image
Path to the firmware image file to be downloaded to the specified device.
-q
Do not print informational messages, only print errors. This option should be used with the -y option to suppress all output.
-s
Run in simulation mode. Device checks are run and the confirmation dialog is shown, but no firmware download will occur.
-v
Show SCSI or ATA errors in the event of a failure.
In simulation mode, print out the SCSI CDB or ATA register values that would be used for the firmware download command.
-y
Do not ask for confirmation.
persist
Persistent reservation support. Persistent reservations are a way to reserve a particular SCSI LUN for use by one or more SCSI initiators. If the -i option is specified, camcontrol will issue the SCSI PERSISTENT RESERVE IN command using the requested service action. If the -o option is specified, camcontrol will issue the SCSI PERSISTENT RESERVE OUT command using the requested service action. One of those two options is required.
Persistent reservations are complex, and fully explaining them is outside the scope of this manual. Please visit http://www.t10.org and download the latest SPC spec for a full explanation of persistent reservations.
-i mode
Specify the service action for the PERSISTENT RESERVE IN command. Supported service actions:
read_keys
Report the current persistent reservation generation (PRgeneration) and any registered keys.
read_reservation
Report the persistent reservation, if any.
report_capabilities
Report the persistent reservation capabilities of the LUN.
read_full_status
Report the full status of persistent reservations on the LUN.
-o mode
Specify the service action for the PERSISTENT RESERVE OUT command. For service actions like register that are components of other service action names, the entire name must be specified. Otherwise, enough of the service action name must be specified to distinguish it from other possible service actions. Supported service actions:
register
Register a reservation key with the LUN or unregister a reservation key. To register a key, specify the requested key as the Service Action Reservation Key. To unregister a key, specify the previously registered key as the Reservation Key. To change a key, specify the old key as the Reservation Key and the new key as the Service Action Reservation Key.
register_ignore
This is similar to the register subcommand, except that the Reservation Key is ignored. The Service Action Reservation Key will overwrite any previous key registered for the initiator.
reserve
Create a reservation. A key must be registered with the LUN before the LUN can be reserved, and it must be specified as the Reservation Key. The type of reservation must also be specified. The scope defaults to LUN scope (LU_SCOPE), but may be changed.
release
Release a reservation. The Reservation Key must be specified.
clear
Release a reservation and remove all keys from the device. The Reservation Key must be specified.
preempt
Remove a reservation belonging to another initiator. The Reservation Key must be specified. The Service Action Reservation Key may be specified, depending on the operation being performed.
preempt_abort
Remove a reservation belonging to another initiator and abort all outstanding commands from that initiator. The Reservation Key must be specified. The Service Action Reservation Key may be specified, depending on the operation being performed.
register_move
Register another initiator with the LUN, and establish a reservation on the LUN for that initiator. The Reservation Key and Service Action Reservation Key must be specified.
replace_lost
Replace Lost Reservation information.
-a
Set the All Target Ports (ALL_TG_PT) bit. This requests that the key registration be applied to all target ports and not just the particular target port that receives the command. This only applies to the register and register_ignore actions.
-I tid
Specify a Transport ID. This only applies to the Register and Register and Move service actions for Persistent Reserve Out. Multiple Transport IDs may be specified with multiple -I arguments. With the Register service action, specifying one or more Transport IDs implicitly enables the -S option which turns on the SPEC_I_PT bit. Transport IDs generally have the format protocol,id.
SAS
A SAS Transport ID consists of “sas,” followed by a 64-bit SAS address. For example:
sas,0x1234567812345678
FC
A Fibre Channel Transport ID consists of “fcp,” followed by a 64-bit Fibre Channel World Wide Name. For example:
fcp,0x1234567812345678
SPI
A Parallel SCSI address consists of “spi,” followed by a SCSI target ID and a relative target port identifier. For example:
spi,4,1
1394
An IEEE 1394 (Firewire) Transport ID consists of “sbp,” followed by a 64-bit EUI-64 IEEE 1394 node unique identifier. For example:
sbp,0x1234567812345678
RDMA
A SCSI over RDMA Transport ID consists of “srp,” followed by a 128-bit RDMA initiator port identifier. The port identifier must be exactly 32 or 34 (if the leading 0x is included) hexadecimal digits. Only hexadecimal (base 16) numbers are supported. For example:
srp,0x12345678123456781234567812345678
iSCSI
An iSCSI Transport ID consists an iSCSI name and optionally a separator and iSCSI session ID. For example, if only the iSCSI name is specified:
iqn.2012-06.com.example:target0
If the iSCSI separator and initiator session ID are specified:
iqn.2012-06.com.example:target0,i,0x123
PCIe
A SCSI over PCIe Transport ID consists of “sop,” followed by a PCIe Routing ID. The Routing ID consists of a bus, device and function or in the alternate form, a bus and function. The bus must be in the range of 0 to 255 inclusive and the device must be in the range of 0 to 31 inclusive. The function must be in the range of 0 to 7 inclusive if the standard form is used, and in the range of 0 to 255 inclusive if the alternate form is used. For example, if a bus, device and function are specified for the standard Routing ID form:
sop,4,5,1
If the alternate Routing ID form is used:
sop,4,1
-k key
Specify the Reservation Key. This may be in decimal, octal or hexadecimal format. The value is zero by default if not otherwise specified. The value must be between 0 and 2^64 - 1, inclusive.
-K key
Specify the Service Action Reservation Key. This may be in decimal, octal or hexadecimal format. The value is zero by default if not otherwise specified. The value must be between 0 and 2^64 - 1, inclusive.
-p
Enable the Activate Persist Through Power Loss bit. This is only used for the register and register_ignore actions. This requests that the reservation persist across power loss events.
-s scope
Specify the scope of the reservation. The scope may be specified by name or by number. The scope is ignored for register, register_ignore and clear. If the desired scope isn't available by name, you may specify the number.
lun
LUN scope (0x00). This encompasses the entire LUN.
extent
Extent scope (0x01).
element
Element scope (0x02).
-R rtp
Specify the Relative Target Port. This only applies to the Register and Move service action of the Persistent Reserve Out command.
-S
Enable the SPEC_I_PT bit. This only applies to the Register service action of Persistent Reserve Out. You must also specify at least one Transport ID with -I if this option is set. If you specify a Transport ID, this option is automatically set. It is an error to specify this option for any service action other than Register.
-T type
Specify the reservation type. The reservation type may be specified by name or by number. If the desired reservation type isn't available by name, you may specify the number. Supported reservation type names:
read_shared
Read Shared mode.
wr_ex
Write Exclusive mode. May also be specified as “write_exclusive”.
rd_ex
Read Exclusive mode. May also be specified as “read_exclusive”.
ex_ac
Exclusive access mode. May also be specified as “exclusive_access”.
wr_ex_ro
Write Exclusive Registrants Only mode. May also be specified as “write_exclusive_reg_only”.
ex_ac_ro
Exclusive Access Registrants Only mode. May also be specified as “exclusive_access_reg_only”.
wr_ex_ar
Write Exclusive All Registrants mode. May also be specified as “write_exclusive_all_regs”.
ex_ac_ar
Exclusive Access All Registrants mode. May also be specified as “exclusive_access_all_regs”.
-U
Specify that the target should unregister the initiator that sent the Register and Move request. By default, the target will not unregister the initiator that sends the Register and Move request. This option only applies to the Register and Move service action of the Persistent Reserve Out command.
attrib
Issue the SCSI READ or WRITE ATTRIBUTE commands. These commands are used to read and write attributes in Medium Auxiliary Memory (MAM). The most common place Medium Auxiliary Memory is found is small flash chips included tape cartriges. For instance, LTO tapes have MAM. Either the -r option or the -w option must be specified.
-r action
Specify the READ ATTRIBUTE service action.
attr_values
Issue the ATTRIBUTE VALUES service action. Read and decode the available attributes and their values.
attr_list
Issue the ATTRIBUTE LIST service action. List the attributes that are available to read and write.
lv_list
Issue the LOGICAL VOLUME LIST service action. List the available logical volumes in the MAM.
part_list
Issue the PARTITION LIST service action. List the available partitions in the MAM.
supp_attr
Issue the SUPPORTED ATTRIBUTES service action. List attributes that are supported for reading or writing. These attributes may or may not be currently present in the MAM.
-w attr
Specify an attribute to write to the MAM. This option is not yet implemented.
-a num
Specify the attribute number to display. This option only works with the attr_values, attr_list and supp_attr arguments to -r.
-c
Display cached attributes. If the device supports this flag, it allows displaying attributes for the last piece of media loaded in the drive.
-e num
Specify the element address. This is used for specifying which element number in a medium changer to access when reading attributes. The element number could be for a picker, portal, slot or drive.
-F form1,form2
Specify the output format for the attribute values (attr_val) display as a comma separated list of options. The default output is currently set to field_all,nonascii_trim,text_raw. Once this code is ported to FreeBSD 10, any text fields will be converted from their codeset to the user's native codeset with iconv(3).
The text options are mutually exclusive; if you specify more than one, you will get unpredictable results. The nonascii options are also mutually exclusive. Most of the field options may be logically ORed together.
text_esc
Print text fields with non-ASCII characters escaped.
text_raw
Print text fields natively, with no codeset conversion.
nonascii_esc
If any non-ASCII characters occur in fields that are supposed to be ASCII, escape the non-ASCII characters.
nonascii_trim
If any non-ASCII characters occur in fields that are supposed to be ASCII, omit the non-ASCII characters.
nonascii_raw
If any non-ASCII characters occur in fields that are supposed to be ASCII, print them as they are.
field_all
Print all of the prefix fields: description, attribute number, attribute size, and the attribute's readonly status. If field_all is specified, specifying any other field options will not have an effect.
field_none
Print none of the prefix fields, and only print out the attribute value. If field_none is specified, specifying any other field options will result in those fields being printed.
field_desc
Print out the attribute description.
field_num
Print out the attribute number.
field_size
Print out the attribute size.
field_rw
Print out the attribute's readonly status.
-p part
Specify the partition. When the media has multiple partitions, specifying different partition numbers allows seeing the values for each individual partition.
-s start_num
Specify the starting attribute number. This requests that the target device return attribute information starting at the given number.
-T elem_type
Specify the element type. For medium changer devices, this allows specifying the type the element referenced in the element address ( -e). Valid types are: “all”, “picker”, “slot”, “portal”, and “drive”.
-V vol_num
Specify the number of the logical volume to operate on. If the media has multiple logical volumes, this will allow displaying or writing attributes on the given logical volume.
opcodes
Issue the REPORT SUPPORTED OPCODES service action of the SCSI MAINTENANCE IN command. Without arguments, this command will return a list of all SCSI commands supported by the device, including service actions of commands that support service actions. It will also include the SCSI CDB (Command Data Block) length for each command, and the description of each command if it is known.
-o opcode
Request information on a specific opcode instead of the list of supported commands. If supported, the target will return a CDB-like structure that indicates the opcode, service action (if any), and a mask of bits that are supported in that CDB.
-s service_action
For commands that support a service action, specify the service action to query.
-N
If a service action is specified for a given opcode, and the device does not support the given service action, the device should not return a SCSI error, but rather indicate in the returned parameter data that the command is not supported. By default, if a service action is specified for an opcode, and service actions are not supported for the opcode in question, the device will return an error.
-T
Include timeout values. This option works with the default display, which includes all commands supported by the device, and with the -o and -s options, which request information on a specific command and service action. This requests that the device report Nominal and Recommended timeout values for the given command or commands. The timeout values are in seconds. The timeout descriptor also includes a command-specific
help
Print out verbose usage information.

ENVIRONMENT

The SCSI_MODES variable allows the user to specify an alternate mode page format file.
The EDITOR variable determines which text editor camcontrol starts when editing mode pages.

FILES

/usr/share/misc/scsi_modes
is the SCSI mode format database.
/dev/xpt0
is the transport layer device.
/dev/pass*
are the CAM application passthrough devices.

EXAMPLES

camcontrol eject -n cd -u 1 -v
Eject the CD from cd1, and print SCSI sense information if the command fails.
camcontrol tur da0
Send the SCSI test unit ready command to da0. The camcontrol utility will report whether the disk is ready, but will not display sense information if the command fails since the -v switch was not specified.
camcontrol tur da1 -E -C 4 -t 50 -v
Send a test unit ready command to da1. Enable kernel error recovery. Specify a retry count of 4, and a timeout of 50 seconds. Enable sense printing (with the -v flag) if the command fails. Since error recovery is turned on, the disk will be spun up if it is not currently spinning. The camcontrol utility will report whether the disk is ready.
camcontrol cmd -n cd -u 1 -v -c "3C 00 00 00 00 00 00 00 0e 00" \ 
	-i 0xe "s1 i3 i1 i1 i1 i1 i1 i1 i1 i1 i1 i1"
Issue a READ BUFFER command (0x3C) to cd1. Display the buffer size of cd1, and display the first 10 bytes from the cache on cd1. Display SCSI sense information if the command fails.
camcontrol cmd -n cd -u 1 -v -c "3B 00 00 00 00 00 00 00 0e 00" \ 
	-o 14 "00 00 00 00 1 2 3 4 5 6 v v v v" 7 8 9 8
Issue a WRITE BUFFER (0x3B) command to cd1. Write out 10 bytes of data, not including the (reserved) 4 byte header. Print out sense information if the command fails. Be very careful with this command, improper use may cause data corruption.
camcontrol modepage da3 -m 1 -e -P 3
Edit mode page 1 (the Read-Write Error Recover page) for da3, and save the settings on the drive. Mode page 1 contains a disk drive's auto read and write reallocation settings, among other things.
camcontrol rescan all
Rescan all SCSI busses in the system for devices that have been added, removed or changed.
camcontrol rescan 0
Rescan SCSI bus 0 for devices that have been added, removed or changed.
camcontrol rescan 0:1:0
Rescan SCSI bus 0, target 1, lun 0 to see if it has been added, removed, or changed.
camcontrol tags da5 -N 24
Set the number of concurrent transactions for da5 to 24.
camcontrol negotiate -n da -u 4 -T disable
Disable tagged queueing for da4.
camcontrol negotiate -n da -u 3 -R 20.000 -O 15 -a
Negotiate a sync rate of 20MHz and an offset of 15 with da3. Then send a Test Unit Ready command to make the settings take effect.
camcontrol smpcmd ses0 -v -r 4 "40 0 00 0" -R 1020 "s9 i1"
Send the SMP REPORT GENERAL command to ses0, and display the number of PHYs it contains. Display SMP errors if the command fails.
camcontrol security ada0
Report security support and settings for ada0
camcontrol security ada0 -U user -s MyPass
Enable security on device ada0 with the password MyPass
camcontrol security ada0 -U user -e MyPass
Secure erase ada0 which has had security enabled with user password MyPass
WARNING! WARNING! WARNING!
This will ERASE ALL data from the device, so backup your data before using!
This command can be used against an SSD drive to restoring it to factory default write performance.
camcontrol hpa ada0
Report HPA support and settings for ada0 (also reported via identify).
camcontrol hpa ada0 -s 10240
Enables HPA on ada0 setting the maximum reported sectors to 10240.
WARNING! WARNING! WARNING!
This will PREVENT ACCESS to all data on the device beyond this limit until HPA is disabled by setting HPA to native max sectors of the device, which can only be done after a power-on or hardware reset!
DO NOT use this on a device which has an active filesystem!
camcontrol persist da0 -v -i read_keys
This will read any persistent reservation keys registered with da0, and display any errors encountered when sending the PERSISTENT RESERVE IN SCSI command.
camcontrol persist da0 -v -o register -a -K 0x12345678
This will register the persistent reservation key 0x12345678 with da0, apply that registration to all ports on da0, and display any errors that occur when sending the PERSISTENT RESERVE OUT command.
camcontrol persist da0 -v -o reserve -s lun -k 0x12345678 -T ex_ac
This will reserve da0 for the exlusive use of the initiator issuing the command. The scope of the reservation is the entire LUN. Any errors sending the PERSISTENT RESERVE OUT command will be displayed.
camcontrol persist da0 -v -i read_full
This will display the full status of all reservations on da0 and print out status if there are any errors.
camcontrol persist da0 -v -o release -k 0x12345678 -T ex_ac
This will release a reservation on da0 of the type ex_ac (Exclusive Access). The Reservation Key for this registration is 0x12345678. Any errors that occur will be displayed.
camcontrol persist da0 -v -o register -K 0x12345678 -S \ 
	-I sas,0x1234567812345678 -I sas,0x8765432187654321
This will register the key 0x12345678 with da0, specifying that it applies to the SAS initiators with SAS addresses 0x1234567812345678 and 0x8765432187654321.
camcontrol persist da0 -v -o register_move -k 0x87654321 \ 
	-K 0x12345678 -U -p -R 2 -I fcp,0x1234567812345678
This will move the registration from the current initiator, whose Registration Key is 0x87654321, to the Fibre Channel initiator with the Fiber Channel World Wide Node Name 0x1234567812345678. A new registration key, 0x12345678, will be registered for the initiator with the Fibre Channel World Wide Node Name 0x1234567812345678, and the current initiator will be unregistered from the target. The reservation will be moved to relative target port 2 on the target device. The registration will persist across power losses.
camcontrol attrib sa0 -v -i attr_values -p 1
This will read and decode the attribute values from partition 1 on the tape in tape drive sa0, and will display any SCSI errors that result.

SEE ALSO

cam(3), cam_cdbparse(3), cam(4), pass(4), xpt(4)

HISTORY

The camcontrol utility first appeared in FreeBSD 3.0.
The mode page editing code and arbitrary SCSI command code are based upon code in the old scsi(8) utility and scsi(3) library, written by Julian Elischer and Peter Dufault. The scsi(8) program first appeared in 386BSD-0.1.2.4, and first appeared in FreeBSD in FreeBSD 2.0.5.

AUTHORS

Kenneth Merry ⟨ken@FreeBSD.org⟩

BUGS

The code that parses the generic command line arguments does not know that some of the subcommands take multiple arguments. So if, for instance, you tried something like this:
camcontrol cmd -n da -u 1 -c "00 00 00 00 00 v" 0x00 -v
The sense information from the test unit ready command would not get printed out, since the first getopt(3) call in camcontrol bails out when it sees the second argument to -c (0x00), above. Fixing this behavior would take some gross code, or changes to the getopt(3) interface. The best way to circumvent this problem is to always make sure to specify generic camcontrol arguments before any command-specific arguments.
August 6, 2015 Debian Sid