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aoe-sancheck - verify storage network capabilities
The aoe-sancheck 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 information:
- The device
name of the form eX.Y where X is the AoE device shelf address, and Y is
the AoE device slot address.
- The number of mac addresses detected for
- 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 visible.
For each device, aoe-sancheck
may print out additional lines of suggestions or warnings. The following
checks are made:
- Prints out additional raw information.
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)
- 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.
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 comparison.
- All local interfaces for an AoE
device have the same MTU.
- 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 payload
- 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 payload size.
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