nfsiostat - Emulate iostat for NFS mount points using
/proc/self/mountstats
nfsiostat [[<interval>]
[<count>]]
[<options>][<mount_point>]
The nfsiostat command displays NFS client per-mount
statisitics.
- <interval>
- specifies the amount of time in seconds between each report. The first
report contains statistics for the time since each file system was
mounted. Each subsequent report contains statistics collected during the
interval since the previous report.
- <count>
- If the <count> parameter is specified, the value of
<count> determines the number of reports generated at
<interval> seconds apart. if the interval parameter is
specified without the <count> parameter, the command
generates reports continuously.
- <options>
- Define below
- <mount_point>
- If one or more <mount point> names are specified, statistics
for only these mount points will be displayed. Otherwise, all NFS mount
points on the client are listed.
- The meaning of each column of
nfsiostat's output is the following:
-
op/s
This is the number of operations per second.
-
rpc bklog
This is the length of the backlog queue.
-
kB/s
This is the number of kB written/read per second.
-
kB/op
This is the number of kB written/read per each
operation.
-
retrans
This is the number of retransmissions.
-
avg RTT (ms)
This is the duration from the time that client's kernel
sends the RPC request until the time it receives the reply.
-
avg exe (ms)
This is the duration from the time that NFS client does
the RPC request to its kernel until the RPC request is completed, this
includes the RTT time above.
- Note that if an interval is
used as argument to nfsiostat, then the diffrence from previous
interval will be displayed, otherwise the results will be from the time that
the share was mounted.
-
Chuck Lever <chuck.lever@oracle.com>