11 .\" See the License for the specific language governing permissions
  12 .\" and limitations under the License.
  13 .\"
  14 .\" When distributing Covered Code, include this CDDL HEADER in each
  15 .\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16 .\" If applicable, add the following below this CDDL HEADER, with the
  17 .\" fields enclosed by brackets "[]" replaced with your own identifying
  18 .\" information: Portions Copyright [yyyy] [name of copyright owner]
  19 .\"
  20 .\" CDDL HEADER END
  21 .\"
  22 .\" Copyright (c) 2003, Sun Microsystems, Inc.  All Rights reserved
  23 .\" Copyright (c) 2012 by Delphix. All rights reserved.
  24 .\"
  25 .TH IOSTAT 1M "Mar 23, 2009"
  26 .SH NAME
  27 iostat \- report I/O statistics
  28 .SH SYNOPSIS
  29 .LP
  30 .nf
  31 \fB/usr/bin/iostat\fR  [\fB-cCdDeEiImMnpPrstxXYz\fR] [\fB-l\fR \fIn\fR] [\fB-T\fR u | d]
  32  [\fIdisk\fR]... [\fIinterval\fR [\fIcount\fR]]
  33 .fi
  34 
  35 .SH DESCRIPTION
  36 .sp
  37 .LP
  38 The \fBiostat\fR utility iteratively reports terminal, disk, and tape \fBI/O\fR
  39 activity, as well as \fBCPU\fR utilization. The first line of output is for all
  40 time since boot; each subsequent line is for the prior interval only.
  41 .sp
  42 .LP
  43 To compute this information, the kernel maintains a number of counters. For
  44 each disk, the kernel counts reads, writes, bytes read, and bytes written. The
  45 kernel also takes hi-res time stamps at queue entry and exit points, which
  46 allows it to keep track of the residence time and cumulative residence-length
  47 product for each queue. Using these values, \fBiostat\fR produces highly
  48 accurate measures of throughput, utilization, queue lengths, transaction rates
  49 and service time. For terminals collectively, the kernel simply counts the
  50 number of input and output characters.
  51 .sp

 350 
 351 .sp
 352 .ne 2
 353 .na
 354 \fB\fB-p\fR\fR
 355 .ad
 356 .RS 12n
 357 For each disk, report per-partition statistics in addition to per-device
 358 statistics.
 359 .RE
 360 
 361 .sp
 362 .ne 2
 363 .na
 364 \fB\fB-P\fR\fR
 365 .ad
 366 .RS 12n
 367 For each disk, report per-partition statistics only, no per-device statistics.
 368 .RE
 369 




















 370 .sp
 371 .ne 2
 372 .na
 373 \fB\fB-r\fR\fR
 374 .ad
 375 .RS 12n
 376 Display data in a comma-separated format.
 377 .RE
 378 
 379 .sp
 380 .ne 2
 381 .na
 382 \fB\fB-s\fR\fR
 383 .ad
 384 .RS 12n
 385 Suppress messages related to \fBstate changes\fR.
 386 .RE
 387 
 388 .sp
 389 .ne 2

  11 .\" See the License for the specific language governing permissions
  12 .\" and limitations under the License.
  13 .\"
  14 .\" When distributing Covered Code, include this CDDL HEADER in each
  15 .\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16 .\" If applicable, add the following below this CDDL HEADER, with the
  17 .\" fields enclosed by brackets "[]" replaced with your own identifying
  18 .\" information: Portions Copyright [yyyy] [name of copyright owner]
  19 .\"
  20 .\" CDDL HEADER END
  21 .\"
  22 .\" Copyright (c) 2003, Sun Microsystems, Inc.  All Rights reserved
  23 .\" Copyright (c) 2012 by Delphix. All rights reserved.
  24 .\"
  25 .TH IOSTAT 1M "Mar 23, 2009"
  26 .SH NAME
  27 iostat \- report I/O statistics
  28 .SH SYNOPSIS
  29 .LP
  30 .nf
  31 \fB/usr/bin/iostat\fR  [\fB-cCdDeEiImMnpPfFrstxXYz\fR] [\fB-l\fR \fIn\fR] [\fB-T\fR u | d]
  32  [\fIdisk\fR]... [\fIinterval\fR [\fIcount\fR]]
  33 .fi
  34 
  35 .SH DESCRIPTION
  36 .sp
  37 .LP
  38 The \fBiostat\fR utility iteratively reports terminal, disk, and tape \fBI/O\fR
  39 activity, as well as \fBCPU\fR utilization. The first line of output is for all
  40 time since boot; each subsequent line is for the prior interval only.
  41 .sp
  42 .LP
  43 To compute this information, the kernel maintains a number of counters. For
  44 each disk, the kernel counts reads, writes, bytes read, and bytes written. The
  45 kernel also takes hi-res time stamps at queue entry and exit points, which
  46 allows it to keep track of the residence time and cumulative residence-length
  47 product for each queue. Using these values, \fBiostat\fR produces highly
  48 accurate measures of throughput, utilization, queue lengths, transaction rates
  49 and service time. For terminals collectively, the kernel simply counts the
  50 number of input and output characters.
  51 .sp

 350 
 351 .sp
 352 .ne 2
 353 .na
 354 \fB\fB-p\fR\fR
 355 .ad
 356 .RS 12n
 357 For each disk, report per-partition statistics in addition to per-device
 358 statistics.
 359 .RE
 360 
 361 .sp
 362 .ne 2
 363 .na
 364 \fB\fB-P\fR\fR
 365 .ad
 366 .RS 12n
 367 For each disk, report per-partition statistics only, no per-device statistics.
 368 .RE
 369 
 370 .sp
 371 .ne 2
 372 .na
 373 \fB\fB-f\fR\fR
 374 .ad
 375 .RS 12n
 376 Report ZFS-level statistics for ZFS pool and individual vdevs in addition to
 377 per-device statistics.
 378 .RE
 379 
 380 .sp
 381 .ne 2
 382 .na
 383 \fB\fB-F\fR\fR
 384 .ad
 385 .RS 12n
 386 Report ZFS pool and individual physical vdevs statistics only, no per-device
 387 statistics.
 388 .RE
 389 
 390 .sp
 391 .ne 2
 392 .na
 393 \fB\fB-r\fR\fR
 394 .ad
 395 .RS 12n
 396 Display data in a comma-separated format.
 397 .RE
 398 
 399 .sp
 400 .ne 2
 401 .na
 402 \fB\fB-s\fR\fR
 403 .ad
 404 .RS 12n
 405 Suppress messages related to \fBstate changes\fR.
 406 .RE
 407 
 408 .sp
 409 .ne 2