iostat man page on NetBSD

Man page or keyword search:  
man Server   9087 pages
apropos Keyword Search (all sections)
Output format
NetBSD logo
[printable version]

IOSTAT(8)		  BSD System Manager's Manual		     IOSTAT(8)

NAME
     iostat — report I/O statistics

SYNOPSIS
     iostat [-CdDITx] [-c count] [-M core] [-N system] [-w wait] [drives]

DESCRIPTION
     iostat displays kernel I/O statistics on terminal, disk and CPU opera‐
     tions.  By default, iostat displays one line of statistics averaged over
     the machine's run time.  The use of -c presents successive lines averaged
     over the wait period.  The -I option causes iostat to print raw, unaver‐
     aged values.

     Only the last disk option specified (-d, -D, or -x) is used.

     The options are as follows:

     -c count	 Repeat the display count times.  Unless the -I flag is in
		 effect, the first display is for the time since a reboot and
		 each subsequent report is for the time period since the last
		 display.  If no wait interval is specified, the default is 1
		 second.

     -C		 Show CPU statistics.  This is enabled by default unless the
		 -d, -D, -T, or -x flags are used.

     -d		 Show disk statistics.	This is the default.  Displays kilo‐
		 bytes per transfer, number of transfers, and megabytes trans‐
		 ferred.  Use of this flag disables display of CPU and tty
		 statistics.

     -D		 Show alternative disk statistics.  Displays kilobytes trans‐
		 ferred, number of transfers, and time spent in transfers.
		 Use of this flag disables the default display.

     -I		 Show the running total values, rather than an average.

     -M core	 Extract values associated with the name list from the speci‐
		 fied core instead of the default “/dev/mem”.

     -N system	 Extract the name list from the specified system instead of
		 the default “/netbsd”.

     -T		 Show tty statistics.  This is enabled by default unless the
		 -C, -d, or -D flags are used.

     -w wait	 Pause wait seconds between each display.  If no repeat count
		 is specified, the default is infinity.

     -x		 Show extended disk statistics.	 Each disk is displayed on a
		 line of its own with all available statistics.	 This option
		 overrides all other display options, and all disks are dis‐
		 played unless specific disks are provided as arguments.
		 Additionally, separate read and write statistics are dis‐
		 played.

     iostat displays its information in the following format:

     tty
	   tin	   characters read from terminals
	   tout	   characters written to terminals

     disks
	   Disk operations.  The header of the field is the disk name and unit
	   number.  If more than four disk drives are configured in the sys‐
	   tem, iostat displays only the first four drives.  To force iostat
	   to display specific drives, their names may be supplied on the com‐
	   mand line.

	   KB/t	   Kilobytes transferred per disk transfer
	   t/s	   transfers per second
	   MB/s	   Megabytes transferred per second

	   The alternative display format, (selected with -D), presents the
	   following values.
	   KB	   Kilobytes transferred
	   xfr	   Disk transfers
	   time	   Seconds spent in disk activity

     cpu
	   us	   % of CPU time in user mode
	   ni	   % of CPU time in user mode running niced processes
	   sy	   % of CPU time in system mode
	   id	   % of CPU time in idle mode

FILES
     /netbsd   Default kernel namelist.
     /dev/mem  Default memory file.

SEE ALSO
     fstat(1), netstat(1), nfsstat(1), ps(1), systat(1), vmstat(1), pstat(8)

     The sections starting with ``Interpreting system activity'' in Installing
     and Operating 4.3BSD.

HISTORY
     iostat appeared in Version 6 AT&T UNIX.  The -x option was added in
     NetBSD 1.4.

BSD				 March 1, 2003				   BSD
[top]
                             _         _         _ 
                            | |       | |       | |     
                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 
More information is available in HTML format for server NetBSD

List of man pages available for NetBSD

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net