nfsiostat - Emulate iostat for NFS mount points using /proc/self/mountstats
nfsiostat [[<interval>] [<count>]]
command displays NFS client per-mount statisitics.
- 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.
- 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.
- Define below
- 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
This is the number of operations per second.
- rpc bklog
This is the length of the backlog queue.
This is the number of kB written/read per
This is the number of kB written/read per each
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
- 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
- -a or --attr
- displays statistics related to the attribute cache
- -d or --dir
- displays statistics related to directory operations
- -h or --help
- shows help message and exit
- -l LIST or --list=LIST
- only print stats for first LIST mount points
- -p or --page
- displays statistics related to the page cache
- -s or --sort
- Sort NFS mount points by ops/second
- show program's version number and exit
Chuck Lever <email@example.com>