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NAME | SYNOPSIS | DESCRIPTION | REPORT | OPTIONS | ENVIRONMENT | BUG | FILE | WARNING | AUTHOR | SEE ALSO | COLOPHON |
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 systat-AT-orange.fr. This
page was obtained from the project's upstream Git repository
⟨https://github.com/sysstat/sysstat.git⟩ on 2017-07-05. If you dis‐
cover 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)