display NFS statistics
command displays statistics kept
about NFS client and server activity. For the NFSv4 server, the statistics are
for operations within the Compound RPCs and not the count of RPCs. If you wish
to compare RPC counts between NFSv3 and NFSv4, you must use statistics in the
The options are as follows:
- Only display client side statistics.
- Display statistics for the NFS server that are similar to those displayed
This includes kilobytes per transfer, transfers per second, and megabytes
per second for read, write, and all operations. It also includes the
current queue depth, the busy percentage, and latency for all operations.
-W flag is added, commits per
second, commit latency, read latency, and write latency are also added to
the display. The busy percentage shown can exceed 100 at times. This is
because of the way busy percentages are calculated. The busy time is
calculated by adding the elapsed time between the last time an operation
started or finished, and the current time. If there is only one operation
outstanding, the "busy time" time will get updated with the
total time of that operation. That means that the difference in the busy
time between the two measurement intervals (often 1 second) will increase
by more than the measurement interval.
- Report the extra statistics collected by the NFS client and server for
- Similar to
-e except that the
statistics include NFSv4.1 and the numbers aren't clipped at one billion.
Only one of
-E can be specified.
- Extract values associated with the name list from the specified core
instead of the default /dev/kmem.
- Report the mount options for all NFS client mounts. This option overrides
all others and
nfsstat will exit after
completing the report.
- Extract the name list from the specified system instead of the default
- Only display server side statistics.
- Use wide format with interval short summary. This option is especially
useful when combined with
-s and a time delay.
- Display a shorter summary of NFS activity for both the client and server
at wait second intervals.
- Reset statistics after displaying them.
- Do not print header
- Generate output via
in a selection of different human and machine readable formats. See
for details on command line arguments.
- default kernel namelist
- default memory file
command appeared in