aoe-stat

NAME

aoe-stat - print aoe device status report

SYNOPSIS

modprobe aoe
aoe-stat
env sysfs_dir=/sys aoe-stat

DESCRIPTION

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.

devicename

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.

payload

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.

UNAVAILABLE TARGETS

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.

ENVIRONMENT VARIABLES

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.

WARNINGS

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.

EXAMPLE

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            
nai:~# 
    

SEE ALSO

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

AUTHOR

Ed L. Cashin ([email protected])