Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help 
IOZTAT(8)		    System Manager's Manual		     IOZTAT(8)

NAME
       ioztat -- display logical I/O statistics	for ZFS	datasets

SYNOPSIS
       ioztat -V | --version
       ioztat -h | --help
       ioztat	 [-DeHINnoSxyz]	   [-c	 count]	  [-i	interval]   [-T	  u|d]
	      [-s      name|operations|reads|writes|throughput|nread|nwritten]
	      [dataset ...] [interval [count]]

DESCRIPTION
       The  ioztat  utility displays logical I/O statistics for	individual ZFS
       datasets.  The first report is averaged over the	system	uptime	unless
       suppressed  with	 -y.  If an interval is	specified, this	is followed by
       reports averaged	over the reporting interval.  If  -y  or  a  count  is
       specified, interval defaults to one second.

       Underlying  device  I/O depends on pool and dataset configuration.  See
       zpool-iostat(8) and iostat(8) for reporting on these values.

       To filter output	you may	pass in	a list of datasets.   If  no  datasets
       are  specified,	statistics for every mounted dataset in	the system are
       shown.  If the -n option	is given, child	datasets are not included  for
       any specified dataset unless they are also directly specified.

       The options are as follows:

       -D    Display formatted byte sizes using	decimal	powers of 1000 instead
	     of	powers of 1024.

       -c    Display count reports and exit.  This can also be specified after
	     an	 interval  at  the  end	 of the	argument list.	If interval is
	     specified but not count then it defaults to  infinity,  otherwise
	     it	defaults to one.

       -e    Display exact values, without truncating dataset names (unless -p
	     is	given) or formatting numeric output.

       -H    Scripted  mode,  skip  headers and	tab-separate fields instead of
	     using arbitrary whitespace.

       -h, --help
	     Display help text and exit.

       -I    Display total statistics since the	last report instead  of	 aver-
	     ages per-second.

       -i    Pause  interval seconds between reports.  This can	also be	speci-
	     fied at the end of	the argument list, prior to an optional	count.
	     If	no interval is specified the default is	1 second.

	     The ioztat	command	will  accept  non-integer  intervals,  but  it
	     should be noted the reporting interval is not exact.

       -N    Display  headers  only  once,  instead  of	periodically repeating
	     them.

       -n    Omit children of any specified datasets that  haven't  themselves
	     been explicitly specified.

       -o    Overwrite	mode.	Before each report, clear the screen and print
	     only as many lines	as will	fit.

       -P    Display dataset names on a	single line.

       -p    Display dataset names as an indented tree spread across  multiple
	     lines.   These  options  override defaults	that may be applied by
	     different sorting and display modes.

       -S    Sum child dataset statistics into their  parents.	 This  can  be
	     useful  when  combined  with -n to	omit display of	child datasets
	     while still seeing	associated I/O.

       -s    Sort each report by the specified order.  Defaults	to name.

       -T u|d
	     Before each report, display a timestamp.  Specify u for a numeric
	     Unix timestamp in seconds since the epoch,	or d for  a  formatted
	     date-time.

       -V, --version
	     Display the current version of ioztat and exit.

       -x    Specified once, display an	opsize group containing	throughput di-
	     vided  by	operations,  giving the	average	byte size of each I/O.
	     Specified twice, also display an unlinks section giving  a	 count
	     of	 the  number of	files and directories queued for deletion, and
	     the number	which have been	deleted.

       -y    Omit statistics since boot.  This suppresses output for the first
	     interval seconds.

       -z    Omit datasets which have no activity.

EXAMPLES
	     ioztat rpool/USERDATA 1

       Display	per-second  statistics	for  any   mounted   datasets	within
       rpool/USERDATA.

	     ioztat -zoTd -s operations	5

       Display	statistics  for	all mounted datasets with activity across five
       second intervals, ordered by total read and write  operations,  limited
       by  available display and overwriting prior reports in a	manner similar
       to top(1).

	     ioztat -SIn rpool

       Display sum total of I/O	for all	datasets within	rpool since boot.

	     ioztat -Hey

       Display a single	one-second report for all mounted  datasets,  using  a
       machine-readable	 format	 omitting headers, using tab-delimited fields,
       and providing exact values.

SEE ALSO
       iostat(8), zfs(8), zpool-iostat(8)

BUGS
       Please report any issues	at  https://github.com/jimsalterjrs/ioztat/is-
       sues

FreeBSD	13.2		       January 29, 2022			     IOZTAT(8)
NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO | BUGS

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=ioztat&sektion=8&manpath=FreeBSD+14.0-RELEASE+and+Ports>

home | help