bdd303d7a7
update the default disk number selection to note that it uses the current terminal size to fit disks, not hard coded 4.
208 lines
5.1 KiB
Groff
208 lines
5.1 KiB
Groff
.\" $NetBSD: iostat.8,v 1.24 2015/07/09 13:26:52 mrg Exp $
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.\"
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.\" Copyright (c) 1985, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)iostat.8 8.1 (Berkeley) 6/6/93
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.\"
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.Dd July 9, 2015
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.Dt IOSTAT 8
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.Os
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.Sh NAME
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.Nm iostat
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.Nd report
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.Tn I/O
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statistics
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.Sh SYNOPSIS
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.Nm
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.Op Fl CdDITx
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.Op Fl c Ar count
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.Op Fl w Ar wait
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.Op Ar drives
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.Sh DESCRIPTION
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.Nm
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displays kernel
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.Tn I/O
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statistics on terminal, disk and CPU operations.
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By default,
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.Nm
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displays one line of statistics averaged over the machine's run time.
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The use of
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.Fl c
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presents successive lines averaged over the
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.Ar wait
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period.
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The
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.Fl I
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option causes
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.Nm
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to print raw, unaveraged values.
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.Pp
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Only the last disk option specified
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.Fl ( d ,
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.Fl D ,
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or
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.Fl x )
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is used.
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.Pp
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The options are as follows:
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.Bl -tag -width XNXsystemX
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.It Fl c Ar count
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Repeat the display
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.Ar count
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times.
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Unless the
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.Fl I
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flag is in effect, the first display is for the time since a reboot and
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each subsequent report is for the time period since the last display.
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If no
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.Ar wait
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interval is specified, the default is 1 second.
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.It Fl C
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Show CPU statistics.
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This is enabled by default unless the
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.Fl d ,
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.Fl D ,
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.Fl T ,
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or
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.Fl x
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flags are used.
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.It Fl d
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Show disk statistics.
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This is the default.
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Displays kilobytes per
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transfer, number of transfers, and megabytes transferred.
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Use of this flag disables display of CPU and tty statistics.
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.It Fl D
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Show alternative disk statistics.
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Displays kilobytes transferred, number of
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transfers, and time spent in transfers.
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Use of this flag disables the default display.
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.It Fl I
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Show the running total values, rather than an average.
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.It Fl T
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Show tty statistics.
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This is enabled by default unless the
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.Fl C ,
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.Fl d ,
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or
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.Fl D
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flags are used.
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.It Fl w Ar wait
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Pause
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.Ar wait
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seconds between each display.
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If no repeat
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.Ar count
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is specified, the default is infinity.
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.It Fl x
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Show extended disk statistics.
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Each disk is displayed on a line of its own with all available
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statistics.
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This option overrides all other display options, and all
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disks are displayed unless specific disks
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are provided as arguments.
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Additionally, separate read and write statistics are displayed.
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.El
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.Pp
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.Nm
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displays its information in the following format:
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.Bl -tag -width flag
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.It tty
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.Bl -tag -width indent -compact
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.It tin
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characters read from terminals
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.It tout
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characters written to terminals
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.El
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.It disks
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Disk operations.
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The header of the field is the disk name and unit number.
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If more drives are configured in the system that fit across the
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current display,
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.Nm
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displays only those drives that fit on the display.
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To force
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.Nm
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to display specific drives, they may be supplied on the command
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line, either as names or
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.Fn fnmatch
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patterns.
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.Pp
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.Bl -tag -width indent -compact
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.It KB/t
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Kilobytes transferred per disk transfer
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.It t/s
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transfers per second
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.It MB/s
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Megabytes transferred per second
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.Pp
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.El
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The alternative display format, (selected with
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.Fl D ) ,
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presents the following values.
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.Bl -tag -width indent -compact
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.It KB
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Kilobytes transferred
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.It xfr
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Disk transfers
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.It time
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Seconds spent in disk activity
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.El
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.It cpu
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.Bl -tag -width indent -compact
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.It \&us
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% of CPU time in user mode
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.It \&ni
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% of CPU time in user mode running niced processes
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.It \&sy
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% of CPU time in system mode
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.It \&id
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% of CPU time in idle mode
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.El
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.El
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.Sh SEE ALSO
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.Xr fstat 1 ,
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.Xr netstat 1 ,
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.Xr nfsstat 1 ,
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.Xr \&ps 1 ,
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.Xr systat 1 ,
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.Xr vmstat 1 ,
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.Xr fnmatch 3 ,
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.Xr pstat 8
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.Pp
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The sections starting with ``Interpreting system activity'' in
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.%T "Installing and Operating 4.3BSD" .
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.Sh HISTORY
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.Nm
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appeared in
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.At v6 .
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The
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.Fl x
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option was added in
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.Nx 1.4 .
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