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NAME | SYNOPSIS | DESCRIPTION | OUTPUT FORMAT | FIELD DESCRIPTIONS | OPTIONS | NOTES | PCP ENVIRONMENT | SEE ALSO | COLOPHON |
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PCP-NFSIOSTAT(1) General Commands Manual PCP-NFSIOSTAT(1)
pcp-nfsiostat - Emulate iostat for NFS mount points using
/proc/self/mountstats
pcp [pcp options] nfsiostat [-s samples] [-a archive] [-Z
--timezone] [-z --hostzone] [-V Version]
The pcp-nfsiostat command reports client-side Network File System
(NFS) I/O statistics for each mounted NFS filesystem. For every
NFS mountpoint, the output consists of a summary section followed
by detailed read and write statistics blocks. These statistics
include operation rates, data throughput, latency,
retransmissions, queueing delays, and error counts. By default,
pcp-nfsiostat monitors NFS mountpoints on the local host and
reports live metrics collected via the PCP NFS PMDA. When an
archive is specified, historical metrics are reported instead.
Statistics are reported per mounted NFS filesystem using the
following layout:
server:/export mounted on /mount/point:
ops/s rpc bklog
0.017 0.000
read: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) avg queue (ms) errors
...
write: ops/s kB/s kB/op retrans avg RTT (ms) avg exe (ms) avg queue (ms) errors
...
ops/s Number of NFS operations performed per second.
rpc bklog
Average number of RPC requests waiting to be transmitted.
kB/s Kilobytes transferred per second.
kB/op Average number of kilobytes transferred per operation.
retrans
Number of RPC retransmissions and the retransmission
percentage.
avg RTT (ms)
Average round-trip time in milliseconds for RPC requests.
avg exe (ms)
Average execution time in milliseconds spent servicing
requests on the server.
avg queue (ms)
Average time in milliseconds spent waiting in the RPC
transmission queue.
errors Number of failed operations and failure percentage.
-a, --archive Iarchive
Fetch NFS I/O statistics from the specified PCP archive.
-s, --samples Isamples
Number of samples to collect before exiting.
-z, --hostzone
Set the reporting timezone to the local timezone of the
metrics source.
-Z, --timezone Itz
Set the reporting timezone.
-V, --version
Display version information and exit.
-?, --help
Display usage information and exit.
pcp-nfsiostat reports client-side NFS statistics collected from
the kernel and exposed via the PCP NFS PMDA. The output format and
metrics are similar to those reported by the nfsiostat(1) tool
from the nfs-utils package.
Environment variables with the prefix PCP_ are used to
parameterize the file and directory names used by PCP. On each
installation, the file /etc/pcp.conf contains the local values for
these variables. The $PCP_CONF variable may be used to specify an
alternative configuration file, as described in pcp.conf(5).
For environment variables affecting PCP tools, see
pmGetOptions(3).
PCPIntro(1), pcp(1), nfsiostat(1), environ(7).
This page is part of the PCP (Performance Co-Pilot) project.
Information about the project can be found at
⟨http://www.pcp.io/⟩. If you have a bug report for this manual
page, send it to pcp@groups.io. This page was obtained from the
project's upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2026-01-16.
(At that time, the date of the most recent commit that was found
in the repository was 2026-01-16.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
Performance Co-Pilot PCP PCP-NFSIOSTAT(1)
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HTML rendering created 2026-01-16 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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