sg_get_lba_status - send SCSI GET LBA STATUS command
] [ --maxlen=LEN
Send the SCSI GET LBA STATUS command to the DEVICE
and outputs the
response. This command was introduced in (draft) SBC-3 revision 20 and devices
that support logical block provisioning should support this command.
The default action is to decode the response into one LBA status descriptor per
line output to stdout. The descriptor LBA is output in hex (prefixed by '0x')
and the number of blocks is output in decimal followed by the provisioning
status in decimal. The provisioning status can be in the range 0 to 15 of
which only 0 (mapped), 1 (unmapped) and 2 (anchored) are used currently. The
amount of output can be reduced by the --brief
Arguments to long options are mandatory for short options as well.
- -b, --brief
- when use once then one LBA status descriptor per line is
output to stdout. Each line has this format:
<provisioning_status>". So the descriptor's starting LBA and
number of blocks are output in hex and the provisioning status in decimal.
When used twice (e.g. '-bb' or '--brief --brief') then the provisioning
status of the given LBA (or LBA 0 if the --lba option is not
given) is output to stdout. A check is made that the given LBA lies
in the range of the first returned LBA status descriptor (as it should
according to SBC-3 revision 20) and warnings are sent to stderr if it
- -h, --help
- output the usage message then exit.
- -H, --hex
- output response to this command in ASCII hex.
- -l, --lba=LBA
- where LBA is the starting Logical Block Address
(LBA) to check the provisioning status for. Note that the DEVICE
chooses how many following blocks that it will return provisioning status
- -m, --maxlen=LEN
- where LEN is the (maximum) response length in bytes.
It is placed in the cdb's "allocation length" field. If not
given then 24 is used. 24 is enough space for the response header and one
LBA status descriptor. LEN should be 8 plus a multiple of 16 (e.g.
24, 40, and 56 are suitable).
- -r, --raw
- output response in binary (to stdout).
- -R, --readonly
- open the DEVICE read-only (e.g. in Unix with the
O_RDONLY flag). The default is to open it read-write.
- -v, --verbose
- increase the level of verbosity, (i.e. debug output).
Additional output caused by this option is sent to stderr.
- -V, --version
- print the version string and then exit.
In SBC-3 revision 25 the calculation associated with the Parameter Data Length
field in the response was modified. Prior to that the byte offset was 8 and in
revision 25 it was changed to 4.
For a discussion of logical block provisioning see section 4.7 of sbc3r29.pdf at
http://www.t10.org (or the corresponding section of a later draft).
The exit status of sg_get_lba_status is 0 when it is successful. Otherwise see
the sg3_utils(8) man page.
Written by Douglas Gilbert.
Report bugs to <dgilbert at interlog dot com>.
Copyright © 2009-2014 Douglas Gilbert
This software is distributed under a FreeBSD license. There is NO warranty; not
even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.