1 .TH NFSIOSTAT-SYSSTAT 1 "JANUARY 2014" Linux "Linux User's Manual" -*- nroff -*-
3 nfsiostat-sysstat (the nfsiostat command from the sysstat package) \- Report input/output statistics for network filesystems (NFS).
5 .ie 'yes'@WITH_DEBUG@' \{
6 .B nfsiostat-sysstat [ -h ] [ -k | -m ] [ -t ] [ -V ] [ --debuginfo ] [
13 .B nfsiostat-sysstat [ -h ] [ -k | -m ] [ -t ] [ -V ] [
22 command displays statistics about read and write operations
27 parameter specifies the amount of time in seconds between
28 each report. The first report contains statistics for the time since
29 system startup (boot). Each subsequent report contains statistics
30 collected during the interval since the previous report.
31 A report consists of an NFS header row followed by
32 a line of statistics for each network filesystem that is mounted.
35 parameter can be specified in conjunction with the
39 parameter is specified, the value of
41 determines the number of reports generated at
45 parameter is specified without the
49 command generates reports continuously.
52 The Network Filesystem (NFS) report provides statistics for each mounted network filesystem.
53 Transfer rates are shown in 1K blocks by default, unless the environment
54 variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
55 The report shows the following fields:
59 This columns shows the hostname of the NFS server followed by a colon and
60 by the directory name where the network filesystem is mounted.
63 .B rBlk_nor/s (rkB_nor/s, rMB_nor)
65 Indicate the number of blocks (kilobytes, megabytes) read by applications
66 via the read(2) system
67 call interface. A block has a size of 512 bytes.
70 .B wBlk_nor/s (wkB_nor/s, wMB_nor/s)
72 Indicate the number of blocks (kilobytes, megabytes) written by applications
73 via the write(2) system
77 .B rBlk_dir/s (rkB_dir/s, rMB_dir/s)
79 Indicate the number of blocks (kilobytes, megabytes) read from files
80 opened with the O_DIRECT flag.
83 .B wBlk_dir/s (wkB_dir/s, wMB_dir/s)
85 Indicate the number of blocks (kilobytes, megabytes) written to files
86 opened with the O_DIRECT flag.
89 .B rBlk_svr/s (rkB_svr/s, rMB_svr/s)
91 Indicate the number of blocks (kilobytes, megabytes) read from the server
92 by the NFS client via an NFS READ request.
95 .B wBlk_svr/s (wkB_svr/s, wMB_svr/s)
97 Indicate the number of blocks (kilobytes, megabytes) written to the server
98 by the NFS client via an NFS WRITE request.
103 Indicate the number of operations that were issued to the filesystem per second.
108 Indicate the number of 'read' operations that were issued to the filesystem
114 Indicate the number of 'write' operations that were issued to the filesystem
119 .if 'yes'@WITH_DEBUG@' \{
121 Print debug output to stderr.
124 Make the NFS report easier to read by a human.
126 Display statistics in kilobytes per second.
128 Display statistics in megabytes per second.
130 Print the time for each report displayed. The timestamp format may depend
131 on the value of the S_TIME_FORMAT environment variable (see below).
133 Print version number then exit.
138 command takes into account the following environment variables:
141 If this variable exists and its value is
143 then the current locale will be ignored when printing the date in the report
146 command will use the ISO 8601 format (YYYY-MM-DD) instead.
147 The timestamp displayed with option -t will also be compliant with ISO 8601
151 When this variable is set, transfer rates are shown in 512-byte blocks instead
152 of the default 1K blocks.
156 filesystem must be mounted for
161 .I /proc/self/mountstats
162 contains statistics for network filesystems.
166 command from the sysstat package (nfsiostat-sysstat) is now obsolete and is no longer maintained.
167 It will be removed in a future sysstat version.
175 Written by Ivana Varekova (varekova <at> redhat.com)