Ubuntu Manpage: aoe-sancheck - verify storage network capabilities

NAME

       aoe-sancheck - verify storage network capabilities

SYNOPSIS

       aoe-sancheck [-v]

DESCRIPTION

       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:

       Device The device name of the form eX.Y where X is the AoE device shelf address, and Y  is
              the AoE device slot address.

       Macs   The number of mac addresses detected for this device.

       Payload
              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.

   Options
       -v     Prints out additional raw information.

DIAGNOSIS

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 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 interfaces.

Each path to the device is capable of the configured payload size.
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.

BUGS

       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.

       The program probes only the first 32 ethernet interfaces found in the system.

AUTHORS