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NAME | SYNOPSIS | DESCRIPTION | REPORT | OPTIONS | ENVIRONMENT | BUG | FILE | WARNING | AUTHOR | SEE ALSO | COLOPHON |
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NFSIOSTAT-SYSSTAT(1) Linux User's Manual NFSIOSTAT-SYSSTAT(1)
nfsiostat-sysstat (the nfsiostat command from the sysstat
package) - Report input/output statistics for network filesystems
(NFS).
nfsiostat-sysstat [ -h ] [ -k | -m ] [ -t ] [ -V ] [ interval [
count ] ]
The nfsiostat-sysstat command displays statistics about read and
write operations on NFS filesystems.
The interval parameter specifies the amount of time in seconds
between each report. The first report contains statistics for the
time since system startup (boot). Each subsequent report contains
statistics collected during the interval since the previous
report. A report consists of an NFS header row followed by a
line of statistics for each network filesystem that is mounted.
The count parameter can be specified in conjunction with the
interval parameter. 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 nfsiostat-sysstat command
generates reports continuously.
The Network Filesystem (NFS) report provides statistics for each
mounted network filesystem. Transfer rates are shown in 1K
blocks by default, unless the environment variable
POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
The report shows the following fields:
Filesystem:
This columns shows the hostname of the NFS server followed
by a colon and by the directory name where the network
filesystem is mounted.
rBlk_nor/s (rkB_nor/s, rMB_nor)
Indicate the number of blocks (kilobytes, megabytes) read
by applications via the read(2) system call interface. A
block has a size of 512 bytes.
wBlk_nor/s (wkB_nor/s, wMB_nor/s)
Indicate the number of blocks (kilobytes, megabytes)
written by applications via the write(2) system call
interface.
rBlk_dir/s (rkB_dir/s, rMB_dir/s)
Indicate the number of blocks (kilobytes, megabytes) read
from files opened with the O_DIRECT flag.
wBlk_dir/s (wkB_dir/s, wMB_dir/s)
Indicate the number of blocks (kilobytes, megabytes)
written to files opened with the O_DIRECT flag.
rBlk_svr/s (rkB_svr/s, rMB_svr/s)
Indicate the number of blocks (kilobytes, megabytes) read
from the server by the NFS client via an NFS READ request.
wBlk_svr/s (wkB_svr/s, wMB_svr/s)
Indicate the number of blocks (kilobytes, megabytes)
written to the server by the NFS client via an NFS WRITE
request.
ops/s
Indicate the number of operations that were issued to the
filesystem per second.
rops/s
Indicate the number of 'read' operations that were issued
to the filesystem per second.
wops/s
Indicate the number of 'write' operations that were issued
to the filesystem per second.
-h Make the NFS report easier to read by a human.
-k Display statistics in kilobytes per second.
-m Display statistics in megabytes per second.
-t Print the time for each report displayed. The timestamp
format may depend on the value of the S_TIME_FORMAT
environment variable (see below).
-V Print version number then exit.
The nfsiostat-sysstat command takes into account the following
environment variables:
S_TIME_FORMAT
If this variable exists and its value is ISO then the
current locale will be ignored when printing the date in
the report header. The nfsiostat-sysstat command will use
the ISO 8601 format (YYYY-MM-DD) instead. The timestamp
displayed with option -t will also be compliant with ISO
8601 format.
POSIXLY_CORRECT
When this variable is set, transfer rates are shown in
512-byte blocks instead of the default 1K blocks.
/proc filesystem must be mounted for nfsiostat-sysstat to work.
/proc/self/mountstats contains statistics for network
filesystems.
The nfsiostat command from the sysstat package (nfsiostat-
sysstat) is now obsolete and is no longer maintained. It will be
removed in a future sysstat version. Please use now the
nfsiostat command from the nfs-utils package.
Written by Ivana Varekova (varekova <at> redhat.com)
nfsiostat(8), sar(1), pidstat(1), mpstat(1), vmstat(8),
iostat(1), cifsiostat(1)
This page is part of the sysstat (sysstat performance monitoring
tools) project. Information about the project can be found at
⟨http://sebastien.godard.pagesperso-orange.fr/⟩. If you have a
bug report for this manual page, send it to sysstat-AT-orange.fr.
This page was obtained from the project's upstream Git repository
⟨https://github.com/sysstat/sysstat.git⟩ on 2021-08-27. (At that
time, the date of the most recent commit that was found in the
repository was 2021-07-17.) 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
Linux JANUARY 2014 NFSIOSTAT-SYSSTAT(1)
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