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       aoe-stat - print aoe device status report


       modprobe aoe
       env sysfs_dir=/sys aoe-stat


       The  aoe-stat  script collects information on ATA over Ethernet devices
       from sysfs.

       For each AoE device the kernel has discovered, there is one row in  the
       script’s output.  Each row has the following columns.

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

       size   The size of the AoE device is in gigabytes (billions of  bytes).

       ifname The network interface name is printed in the third column.

              The  number  of bytes read from or written to the storage target
              in each AoE packet appears in the fourth column, unless the  aoe
              driver does not export this information.

       status The  device  status  is in the last column.  Possible values are
              up,  down, and  down,closewait.  The "up" status means  the  aoe
              driver  considers  this device ready for I/O.  The "down" status
              means the opposite.  The "down,closewait" status means that some
              software  still  has  the  device  open, and when this straggler
              closes the device, it will enter the "down" state.


       If the sysfs_dir variable is set in the environment, it  will  override
       the  default location where aoe-stat will look for sysfs, namely  /sys.


       If the minor device number of a device node does not match that of  its
       namesake, aoe-stat will print a warning as shown below.

              nai:~# aoe-stat
                    e0.3         0.104GB   eth0 up
                    e0.4      4398.046GB   eth0 up
                   e20.0      1000.215GB   eth0 up
                   e42.0      2000.431GB   eth0 up
              aoe-stat Warning: device node /dev/etherd/e45.1 has wrong minor device number
                   e45.1      1152.874GB   eth0 up

       Using  such  a device node is dangerous, because its name doesn’t match
       the actual device that you would be reading from and writing to.   Such
       a  broken  device  node should be removed.  Device nodes are created by
       udev or (on systems without udev) by aoe-mkdevs.


       In this example, the root user on a host named nai loads the aoe driver
       module  and  then prints a list of all the available aoe devices.  Then
       he remembers to bring up the storage network interfaces,  does  an  AoE
       discovery, and prints the list again.  This time the list shows all the
       devices in shelf seven.

              nai:~# modprobe aoe
              nai:~# aoe-stat
              nai:~# ifconfig eth3 up
              nai:~# aoe-discover
              nai:~# aoe-stat
                    e0.0     10995.116GB   eth0 up
                    e0.1     10995.116GB   eth0 up
                    e0.2     10995.116GB   eth0 up
                    e1.0      1152.874GB   eth0 up
                    e7.0       370.566GB   eth0 up


       aoe-discover(8),  aoe-interfaces(8),   aoe-mkdevs(8),   aoe-mkshelf(8),
       aoetools(8), udev(7).


       Ed L. Cashin (