aoetools/aoe-stat.8

.TH aoe-stat 8
.SH NAME
aoe-stat \- print aoe device status report
.SH SYNOPSIS
.nf
.B modprobe aoe
.B aoe-stat
.B env sysfs_dir=/sys aoe-stat
.fi
.SH DESCRIPTION
The
.I aoe-stat
script collects information on ATA over Ethernet devices from sysfs.
.PP
For each AoE device the kernel has discovered, there is one row in the
script's output.  Each row has
the following columns.
.TP
.BI devicename
The device name is of the form 
.I eX.Y,
 with 
.I X
being the AoE device shelf address, and 
.I Y 
being the AoE slot address.
.TP
.BI size
The size of the AoE device is in gigabytes (billions of bytes).
.TP
.BI ifname
The network interface name is printed in the third column.
.TP
.BI 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.
.TP
.BI status
The device status is in the last column.  Possible values
are \fI up\fR, \fI down\fR, 
and \fI down,closewait\fR.  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.
.SH 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
.I aoe-stat
command shows the missing information as "(NA)" fields.
.PP
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.
.SH ENVIRONMENT VARIABLES
If the
.I sysfs_dir
variable is set in the environment, it will override the default
location where 
.I aoe-stat
will look for 
sysfs, namely \fI /sys\fR.
.SH WARNINGS
If the minor device number of a device node does not match that of its
namesake, \fIaoe-stat\fP will print a warning as shown below.
.IP
.EX
.nf
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            
.fi
.EE
.PP
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
\fIudev\fP or (on systems without \fIudev\fP) by \fIaoe-mkdevs\fP.
.SH EXAMPLE
In this example, the root user on a host named
.I 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.
.IP
.EX
.nf
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:~# 
.fi
.EE
.SH "SEE ALSO"
.IR aoe-discover (8),
.IR aoe-interfaces (8),
.IR aoe-mkdevs (8),
.IR aoe-mkshelf (8),
.IR aoetools (8),
.IR udev (7).
.SH AUTHOR
Ed L. Cashin (ecashin@coraid.com)