Provided by: aoetools_36-1ubuntu1_i386 bug


       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  a  discovered  AoE target will not respond to I/O commands, some of
       the information needed  to  allow  Linux  to  use  the  device  is  not
       available.   The  aoe-stat  command  shows  the  missing information as
       "(NA)" fields.

       It is normal for "(NA)" fields to appear during the brief time  between
       the  time  that an AoE target is detected and the time the Linux kernel
       finishes reading its partition table.


       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   eth3 up
                    e0.1     10995.116GB   eth3 up
                    e0.2     10995.116GB   eth3 up
                    e1.0      1152.874GB   eth3 up
                    e7.0       370.566GB   eth3 up


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


       Ed L. Cashin (