aoe-sancheck - verify storage network capabilities
command collects information about the local interfaces
and probes the network for ATA over Ethernet devices, validating the paths for
each device. It does not use the aoe kernel module but rather the bpf
interface to evaluate the network. As such, the aoe module does not need to be
loaded to perform the test.
The output of the command is divided into two sections: information about the
local interfaces followed by a list of detected AoE devices. The first section
displays the local interfaces, if the interface is up or down, its configured
MTU, and the PCI ID for the interface.
The second section lists detected AoE devices, one per line, with the following
- The device name of the form eX.Y where X is
the AoE device shelf address, and Y is the AoE device slot
- The number of mac addresses detected for this device.
- The number of bytes of data the device can handle in a
single AoE request. This number does not represent the total frame size as
it does not include bytes from ethernet or AoE headers.
- Local Interfaces
- The list of local interfaces from which the device is
- Prints out additional raw information.
For each device, aoe-sancheck
may print out additional lines of
suggestions or warnings. The following checks are made:
- The MTU of the local interfaces is set high enough to
handle the AoE device's reported payload.
- Depending on the host NIC's capabilities and storage
network switch's capabilities, best performance may or may not be with
local interface MTU set higher than a device's payload size.
- The number of local interfaces matches the number of
interfaces on the device.
- Best performance comes from having a host and device with
comparable bandwidth. Aoe-sancheck simply counts the number of
interfaces involved and does not figure link bandwidth in its
- All local interfaces for an AoE device have the same
- If one interface for a device has a smaller MTU than the
others, the AoE driver must use the smaller payload size for all
- Each path to the device is capable of the configured
- This check detects the situation where a local interface is
configured for jumbo frames and the AoE device is capable of jumbo frames,
but some aspect of the network is incapable of passing frames that size,
for example, a misconfigured switch. Aoe-sancheck reports the
maximum payload size the path is capable of if less than the configured
The program may sometimes display inconsistent results between runs showing that
a path is capable of a smaller frame size than it actually is. If you see this
behavior, please email one of the authors with your verbose output.
Justin Sanders (email@example.com), Sam Hopkins (firstname.lastname@example.org)