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NEX-3729 KRRP changes mess up iostat(1M)
Reviewed by: Alek Pinchuk <alek.pinchuk@nexenta.com>
Reviewed by: Roman Strashkin <roman.strashkin@nexenta.com>
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--- old/usr/src/man/man1m/iostat.1m
+++ new/usr/src/man/man1m/iostat.1m
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21 21 .\"
22 22 .\" Copyright (c) 2003, Sun Microsystems, Inc. All Rights reserved
23 23 .\" Copyright (c) 2012 by Delphix. All rights reserved.
24 24 .\"
25 25 .TH IOSTAT 1M "Mar 23, 2009"
26 26 .SH NAME
27 27 iostat \- report I/O statistics
28 28 .SH SYNOPSIS
29 29 .LP
30 30 .nf
31 -\fB/usr/bin/iostat\fR [\fB-cCdDeEiImMnpPrstxXYz\fR] [\fB-l\fR \fIn\fR] [\fB-T\fR u | d]
31 +\fB/usr/bin/iostat\fR [\fB-cCdDeEiImMnpPfFrstxXYz\fR] [\fB-l\fR \fIn\fR] [\fB-T\fR u | d]
32 32 [\fIdisk\fR]... [\fIinterval\fR [\fIcount\fR]]
33 33 .fi
34 34
35 35 .SH DESCRIPTION
36 36 .sp
37 37 .LP
38 38 The \fBiostat\fR utility iteratively reports terminal, disk, and tape \fBI/O\fR
39 39 activity, as well as \fBCPU\fR utilization. The first line of output is for all
40 40 time since boot; each subsequent line is for the prior interval only.
41 41 .sp
42 42 .LP
43 43 To compute this information, the kernel maintains a number of counters. For
44 44 each disk, the kernel counts reads, writes, bytes read, and bytes written. The
45 45 kernel also takes hi-res time stamps at queue entry and exit points, which
46 46 allows it to keep track of the residence time and cumulative residence-length
47 47 product for each queue. Using these values, \fBiostat\fR produces highly
48 48 accurate measures of throughput, utilization, queue lengths, transaction rates
49 49 and service time. For terminals collectively, the kernel simply counts the
50 50 number of input and output characters.
51 51 .sp
52 52 .LP
53 53 During execution of the kernel status command, the \fBstate\fR of the system
54 54 can change. If relevant, a state change message is included in the \fBiostat\fR
55 55 output, in one of the following forms:
56 56 .sp
57 57 .in +2
58 58 .nf
59 59 <<device added: sd0>>
60 60 <<device removed: sd0>>
61 61 <<partition added: sd0,a>>
62 62 <<partition removed: sd0,a>>
63 63 <<NFS mounted: nfs1>>
64 64 <<NFS unmounted: nfs1>>
65 65 <<multi-path added: ssd4>>
66 66 <<multi-path removed: ssd4>>
67 67 <<controller added: c1>>
68 68 <<controller removed: c1>>
69 69 <<processors added: 1, 3>>
70 70 <<processors removed: 1, 3>>
71 71 .fi
72 72 .in -2
73 73 .sp
74 74
75 75 .sp
76 76 .LP
77 77 Note that the \fBnames\fR printed in these state change messages are affected
78 78 by the \fB-n\fR and \fB-m\fR options as appropriate.
79 79 .sp
80 80 .LP
81 81 For more general system statistics, use \fBsar\fR(1), \fBsar\fR(1M), or
82 82 \fBvmstat\fR(1M).
83 83 .SS "Output"
84 84 .sp
85 85 .LP
86 86 The output of the \fBiostat\fR utility includes the following information.
87 87 .sp
88 88 .ne 2
89 89 .na
90 90 \fB\fBdevice\fR\fR
91 91 .ad
92 92 .RS 10n
93 93 name of the disk
94 94 .RE
95 95
96 96 .sp
97 97 .ne 2
98 98 .na
99 99 \fB\fBr/s\fR\fR
100 100 .ad
101 101 .RS 10n
102 102 reads per second
103 103 .RE
104 104
105 105 .sp
106 106 .ne 2
107 107 .na
108 108 \fB\fBw/s\fR\fR
109 109 .ad
110 110 .RS 10n
111 111 writes per second
112 112 .RE
113 113
114 114 .sp
115 115 .ne 2
116 116 .na
117 117 \fB\fBkr/s\fR\fR
118 118 .ad
119 119 .RS 10n
120 120 kilobytes read per second
121 121 .sp
122 122 The average I/O size during the interval can be computed from \fBkr/s\fR
123 123 divided by \fBr/s\fR.
124 124 .RE
125 125
126 126 .sp
127 127 .ne 2
128 128 .na
129 129 \fB\fBkw/s\fR\fR
130 130 .ad
131 131 .RS 10n
132 132 kilobytes written per second
133 133 .sp
134 134 The average I/O size during the interval can be computed from \fBkw/s\fR
135 135 divided by \fBw/s\fR.
136 136 .RE
137 137
138 138 .sp
139 139 .ne 2
140 140 .na
141 141 \fB\fBwait\fR\fR
142 142 .ad
143 143 .RS 10n
144 144 average number of transactions waiting for service (queue length)
145 145 .sp
146 146 This is the number of I/O operations held in the device driver queue waiting
147 147 for acceptance by the device.
148 148 .RE
149 149
150 150 .sp
151 151 .ne 2
152 152 .na
153 153 \fB\fBactv\fR\fR
154 154 .ad
155 155 .RS 10n
156 156 average number of transactions actively being serviced (removed from the queue
157 157 but not yet completed)
158 158 .sp
159 159 This is the number of I/O operations accepted, but not yet serviced, by the
160 160 device.
161 161 .RE
162 162
163 163 .sp
164 164 .ne 2
165 165 .na
166 166 \fB\fBsvc_t\fR\fR
167 167 .ad
168 168 .RS 10n
169 169 average response time of transactions, in milliseconds
170 170 .sp
171 171 The \fBsvc_t\fR output reports the overall \fBresponse\fR time, rather than the
172 172 \fBservice\fR time, of a device. The overall time includes the time that
173 173 transactions are in queue and the time that transactions are being serviced.
174 174 The time spent in queue is shown with the \fB-x\fR option in the \fBwsvc_t\fR
175 175 output column. The time spent servicing transactions is the true service time.
176 176 Service time is also shown with the \fB-x\fR option and appears in the
177 177 \fBasvc_t\fR output column of the same report.
178 178 .RE
179 179
180 180 .sp
181 181 .ne 2
182 182 .na
183 183 \fB\fB%w\fR\fR
184 184 .ad
185 185 .RS 10n
186 186 percent of time there are transactions waiting for service (queue non-empty)
187 187 .RE
188 188
189 189 .sp
190 190 .ne 2
191 191 .na
192 192 \fB\fB%b\fR\fR
193 193 .ad
194 194 .RS 10n
195 195 percent of time the disk is busy (transactions in progress)
196 196 .RE
197 197
198 198 .sp
199 199 .ne 2
200 200 .na
201 201 \fB\fBwsvc_t\fR\fR
202 202 .ad
203 203 .RS 10n
204 204 average service time in wait queue, in milliseconds
205 205 .RE
206 206
207 207 .sp
208 208 .ne 2
209 209 .na
210 210 \fB\fBasvc_t\fR\fR
211 211 .ad
212 212 .RS 10n
213 213 average service time of active transactions, in milliseconds
214 214 .RE
215 215
216 216 .SH OPTIONS
217 217 .sp
218 218 .LP
219 219 The following options are supported:
220 220 .sp
221 221 .ne 2
222 222 .na
223 223 \fB\fB-c\fR\fR
224 224 .ad
225 225 .RS 12n
226 226 Report the percentage of time the system has spent in user mode, in system
227 227 mode, in dtrace probes, and idling. See the NOTES section and
228 228 \fBmpstat\fR(1m) for more information.
229 229 .RE
230 230
231 231 .sp
232 232 .ne 2
233 233 .na
234 234 \fB\fB-C\fR\fR
235 235 .ad
236 236 .RS 12n
237 237 When the \fB-x\fR option is also selected, report extended disk statistics
238 238 aggregated by \fIcontroller id\fR.
239 239 .RE
240 240
241 241 .sp
242 242 .ne 2
243 243 .na
244 244 \fB\fB-d\fR\fR
245 245 .ad
246 246 .RS 12n
247 247 For each disk, report the number of kilobytes transferred per second, the
248 248 number of transfers per second, and the average service time in milliseconds.
249 249 .RE
250 250
251 251 .sp
252 252 .ne 2
253 253 .na
254 254 \fB\fB-D\fR\fR
255 255 .ad
256 256 .RS 12n
257 257 For each disk, report the reads per second, writes per second, and percentage
258 258 disk utilization.
259 259 .RE
260 260
261 261 .sp
262 262 .ne 2
263 263 .na
264 264 \fB\fB-e\fR\fR
265 265 .ad
266 266 .RS 12n
267 267 Display device error summary statistics. The total errors, hard errors, soft
268 268 errors, and transport errors are displayed.
269 269 .RE
270 270
271 271 .sp
272 272 .ne 2
273 273 .na
274 274 \fB\fB-E\fR\fR
275 275 .ad
276 276 .RS 12n
277 277 Display all device error statistics.
278 278 .RE
279 279
280 280 .sp
281 281 .ne 2
282 282 .na
283 283 \fB\fB-i\fR\fR
284 284 .ad
285 285 .RS 12n
286 286 In \fB-E\fR output, display the \fBDevice ID\fR instead of the \fBSerial No\fR.
287 287 The \fBDevice Id\fR is a unique identifier registered by a driver through
288 288 \fBddi_devid_register\fR(9F).
289 289 .RE
290 290
291 291 .sp
292 292 .ne 2
293 293 .na
294 294 \fB\fB-I\fR\fR
295 295 .ad
296 296 .RS 12n
297 297 Report the counts in each interval, rather than rates (where applicable).
298 298 .RE
299 299
300 300 .sp
301 301 .ne 2
302 302 .na
303 303 \fB\fB-l\fR \fIn\fR\fR
304 304 .ad
305 305 .RS 12n
306 306 Limit the number of disks included in the report to \fIn\fR; the disk limit
307 307 defaults to 4 for \fB-d\fR and \fB-D\fR, and unlimited for \fB-x\fR. Note:
308 308 disks explicitly requested (see \fIdisk\fR below) are not subject to this disk
309 309 limit.
310 310 .RE
311 311
312 312 .sp
313 313 .ne 2
314 314 .na
315 315 \fB\fB-m\fR\fR
316 316 .ad
317 317 .RS 12n
318 318 Report file system mount points. This option is most useful if the \fB-P\fR or
319 319 \fB-p\fR option is also specified or used in conjunction with \fB-Xn\fR or
320 320 \fB-en\fR. The \fB-m\fR option is useful only if the mount point is actually
321 321 listed in the output. This option can only be used in conjunction with the
322 322 \fB-n\fR option.
323 323 .RE
324 324
325 325 .sp
326 326 .ne 2
327 327 .na
328 328 \fB\fB-M\fR\fR
329 329 .ad
330 330 .RS 12n
331 331 Display data throughput in \fBMB\fR/sec instead of KB/sec.
332 332 .RE
333 333
334 334 .sp
335 335 .ne 2
336 336 .na
337 337 \fB\fB-n\fR\fR
338 338 .ad
339 339 .RS 12n
340 340 Display names in descriptive format. For example, \fBcXtYdZ\fR, \fBrmt/N\fR,
341 341 \fBserver:/export/path\fR.
342 342 .sp
343 343 By default, disks are identified by instance names such as \fBssd23\fR or
344 344 \fBmd301\fR. Combining the \fB-n\fR option with the \fB-x\fR option causes disk
345 345 names to display in the \fBcXtYdZsN\fR format which is more easily associated
346 346 with physical hardware characteristics. The \fBcXtYdZsN\fR format is
347 347 particularly useful in FibreChannel (FC) environments where the FC World Wide
348 348 Name appears in the \fBt\fR field.
349 349 .RE
350 350
351 351 .sp
352 352 .ne 2
353 353 .na
354 354 \fB\fB-p\fR\fR
355 355 .ad
356 356 .RS 12n
357 357 For each disk, report per-partition statistics in addition to per-device
358 358 statistics.
359 359 .RE
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360 360
361 361 .sp
362 362 .ne 2
363 363 .na
364 364 \fB\fB-P\fR\fR
365 365 .ad
366 366 .RS 12n
367 367 For each disk, report per-partition statistics only, no per-device statistics.
368 368 .RE
369 369
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 +
370 390 .sp
371 391 .ne 2
372 392 .na
373 393 \fB\fB-r\fR\fR
374 394 .ad
375 395 .RS 12n
376 396 Display data in a comma-separated format.
377 397 .RE
378 398
379 399 .sp
380 400 .ne 2
381 401 .na
382 402 \fB\fB-s\fR\fR
383 403 .ad
384 404 .RS 12n
385 405 Suppress messages related to \fBstate changes\fR.
386 406 .RE
387 407
388 408 .sp
389 409 .ne 2
390 410 .na
391 411 \fB\fB-t\fR\fR
392 412 .ad
393 413 .RS 12n
394 414 Report the number of characters read and written to terminals per second.
395 415 .RE
396 416
397 417 .sp
398 418 .ne 2
399 419 .na
400 420 \fB\fB-T\fR u | d\fR
401 421 .ad
402 422 .RS 12n
403 423 Display a time stamp.
404 424 .sp
405 425 Specify \fBu\fR for a printed representation of the internal representation of
406 426 time. See \fBtime\fR(2). Specify \fBd\fR for standard date format. See
407 427 \fBdate\fR(1).
408 428 .RE
409 429
410 430 .sp
411 431 .ne 2
412 432 .na
413 433 \fB\fB-X\fR\fR
414 434 .ad
415 435 .RS 12n
416 436 For disks under \fBscsi_vhci\fR(7D) control, in addition to disk \fIlun\fR
417 437 statistics, also report statistics for \fIlun\fR.\fIcontroller\fR.
418 438 .RE
419 439
420 440 .sp
421 441 .ne 2
422 442 .na
423 443 \fB\fB-x\fR\fR
424 444 .ad
425 445 .RS 12n
426 446 Report extended disk statistics. By default, disks are identified by instance
427 447 names such as \fBssd23\fR or \fBmd301\fR. Combining the \fBx\fR option with the
428 448 \fB-n\fR option causes disk names to display in the \fBcXtYdZsN\fR format, more
429 449 easily associated with physical hardware characteristics. Using the
430 450 \fBcXtYdZsN\fR format is particularly helpful in the FibreChannel environments
431 451 where the FC World Wide Name appears in the \fBt\fR field.
432 452 .sp
433 453 If no output display is requested (no \fB-x\fR, \fB-e\fR, \fB-E\fR), \fB-x\fR
434 454 is implied.
435 455 .RE
436 456
437 457 .sp
438 458 .ne 2
439 459 .na
440 460 \fB\fB-Y\fR\fR
441 461 .ad
442 462 .RS 12n
443 463 For disks under \fBscsi_vhci\fR(7D) control, in addition to disk \fIlun\fR
444 464 statistics, also report statistics for \fIlun\fR.\fItargetport\fR and
445 465 \fIlun\fR.\fItargetport\fR.\fIcontroller\fR.
446 466 .sp
447 467 In \fB-n\fR (descriptive) mode the \fItargetport\fR is shown in using the
448 468 \fBtarget-port\fR property of the path. Without \fB-n\fR the \fItargetport\fR
449 469 is shown using the shorter \fBport-id\fR. All target ports with the same
450 470 \fBtarget-port\fR property value share the same \fBport-id\fR. The
451 471 \fBtarget-port\fR-to-\fBport-id\fR association does not persist across reboot.
452 472 .sp
453 473 If no output display is requested (no \fB-x\fR, \fB-e\fR, \fB-E\fR), \fB-x\fR
454 474 is implied.
455 475 .RE
456 476
457 477 .sp
458 478 .ne 2
459 479 .na
460 480 \fB\fB-z\fR\fR
461 481 .ad
462 482 .RS 12n
463 483 Do not print lines whose underlying data values are all zeros.
464 484 .RE
465 485
466 486 .sp
467 487 .LP
468 488 The option set \fB-xcnCXTdz\fR \fIinterval\fR is particularly useful for
469 489 determining whether disk I/O problems exist and for identifying problems.
470 490 .SH OPERANDS
471 491 .sp
472 492 .LP
473 493 The following operands are supported:
474 494 .sp
475 495 .ne 2
476 496 .na
477 497 \fB\fIcount\fR\fR
478 498 .ad
479 499 .RS 12n
480 500 Display only \fIcount\fR reports.
481 501 .RE
482 502
483 503 .sp
484 504 .ne 2
485 505 .na
486 506 \fB\fIdisk\fR\fR
487 507 .ad
488 508 .RS 12n
489 509 Explicitly specify the disks to be reported; in addition to any explicit disks,
490 510 any active disks up to the disk limit (see \fB-l\fR above) will also be
491 511 reported.
492 512 .RE
493 513
494 514 .sp
495 515 .ne 2
496 516 .na
497 517 \fB\fIinterval\fR\fR
498 518 .ad
499 519 .RS 12n
500 520 Report once each \fIinterval\fR seconds.
501 521 .RE
502 522
503 523 .SH EXAMPLES
504 524 .LP
505 525 \fBExample 1 \fRUsing \fBiostat\fR to Generate User and System Operation
506 526 Statistics
507 527 .sp
508 528 .LP
509 529 The following command displays two reports of extended device statistics,
510 530 aggregated by \fIcontroller id\fR, for user (\fBus\fR) and system (\fBsy\fR)
511 531 operations. Because the \fB-n\fR option is used with the \fB-x\fR option,
512 532 devices are identified by controller names.
513 533
514 534 .sp
515 535 .in +2
516 536 .nf
517 537 example% \fBiostat\fR \fB-xcnCXTdz\fR \fB5\fR
518 538
519 539
520 540 Mon Nov 24 14:58:36 2003
521 541 cpu
522 542 us sy dt id
523 543 14 31 0 20
524 544 extended device statistics
525 545 r/s w/s kr/s kw wait actv wsvc_t asvc_t %w %b device
526 546 3.8 29.9 145.8 44.0 0.0 0.2 0.1 6.4 0 5 c0
527 547 666.3 814.8 12577.6 17591.1 91.3 82.3 61.6 55.6 0 2 c12
528 548 180.0 234.6 4401.1 5712.6 0.0 147.7 0.0 356.3 0 98 d10
529 549
530 550 Mon Nov 24 14:58:41 2003
531 551 cpu
532 552 us sy dt id
533 553 11 31 1 22
534 554 extended device statistics
535 555 r/s w/s kr/s kw wait actv wsvc_t asvc_t %w %b device
536 556 0.8 41.0 5.2 20.5 0.0 0.2 0.2 4.4 0 6 c0
537 557 565.3 581.7 8573.2 10458.9 0.0 26.6 0.0 23.2 0 3 c12
538 558 106.5 81.3 3393.2 1948.6 0.0 5.7 0.0 30.1 0 99 d10
539 559 .fi
540 560 .in -2
541 561 .sp
542 562
543 563 .LP
544 564 \fBExample 2 \fRUsing \fBiostat\fR to Generate TTY Statistics
545 565 .sp
546 566 .LP
547 567 The following command displays two reports on the activity of five disks in
548 568 different modes of operation. Because the \fB-x\fR option is used, disks are
549 569 identified by instance names.
550 570
551 571 .sp
552 572 .in +2
553 573 .nf
554 574 example% \fBiostat\fR \fB-x\fR \fBtc 5 2\fR
555 575
556 576
557 577 extended device statistics tty cpu
558 578 device r/s w/s kr/s kw/s wait actv svc_t %w %b tin tout us sy dt id
559 579 sd0 0.4 0.3 10.4 8.0 0.0 0.0 36.9 0 1 0 10 0 0 0 99
560 580 sd1 0.0 0.0 0.3 0.4 0.0 0.0 35.0 0 0
561 581 sd6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
562 582 nfs1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
563 583 nfs2 0.0 0.0 0.0 0.1 0.0 0.0 35.6 0 0
564 584 extended device statistics tty cpu
565 585 device r/s w/s kr/s kw/s wait actv svc_t %w %b tin tout us sy dt id
566 586 sd0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 0 155 0 0 0 100
567 587 sd1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
568 588 sd6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
569 589 nfs1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
570 590 nfs2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0
571 591
572 592 .fi
573 593 .in -2
574 594 .sp
575 595
576 596 .LP
577 597 \fBExample 3 \fRUsing \fBiostat\fR to Generate Partition and Device Statistics
578 598 .sp
579 599 .LP
580 600 The following command generates partition and device statistics for each disk.
581 601 Because the \fB-n\fR option is used with the \fB-x\fR option, disks are
582 602 identified by controller names.
583 603
584 604 .sp
585 605 .in +2
586 606 .nf
587 607 example% \fBiostat -xnp\fR
588 608
589 609 extended device statistics
590 610 r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
591 611 0.4 0.3 10.4 7.9 0.0 0.0 0.0 36.9 0 1 c0t0d0
592 612 0.3 0.3 9.0 7.3 0.0 0.0 0.0 37.2 0 1 c0t0d0s0
593 613 0.0 0.0 0.1 0.5 0.0 0.0 0.0 34.0 0 0 c0t0d0s1
594 614 0.0 0.0 0.0 0.1 0.0 0.0 0.6 35.0 0 0 fuji:/export/home/user3
595 615 .fi
596 616 .in -2
597 617 .sp
598 618
599 619 .LP
600 620 \fBExample 4 \fRShow Translation from Instance Name to Descriptive Name
601 621 .sp
602 622 .LP
603 623 The following example illustrates the use of \fBiostat\fR to translate a
604 624 specific instance name to a descriptive name.
605 625
606 626 .sp
607 627 .in +2
608 628 .nf
609 629 example% \fBiostat -xn sd1\fR
610 630 extended device statistics
611 631 r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
612 632 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c8t1d0
613 633 .fi
614 634 .in -2
615 635 .sp
616 636
617 637 .LP
618 638 \fBExample 5 \fRShow Target Port and Controller Activity for a Specific Disk
619 639 .sp
620 640 .LP
621 641 In the following example, there are four controllers, all connected to the same
622 642 target port.
623 643
624 644 .sp
625 645 .in +2
626 646 .nf
627 647 # \fBiostat -Y ssd22\fR
628 648 extended device statistics
629 649 device r/s w/s kr/s kw/s wait actv svc_t %w %b
630 650 ssd22 0.2 0.0 1.5 0.0 0.0 0.0 0.7 0 0
631 651 ssd22.t2 0.2 0.0 1.5 0.0 0.0 0.0 0.0 0 0
632 652 ssd22.t2.fp0 0.0 0.0 0.4 0.0 0.0 0.0 0.0 0 0
633 653 ssd22.t2.fp1 0.0 0.0 0.4 0.0 0.0 0.0 0.0 0 0
634 654 ssd22.t2.fp2 0.0 0.0 0.4 0.0 0.0 0.0 0.0 0 0
635 655 ssd22.t2.fp3 0.0 0.0 0.4 0.0 0.0 0.0 0.0 0 0
636 656 .fi
637 657 .in -2
638 658 .sp
639 659
640 660 .SH ATTRIBUTES
641 661 .sp
642 662 .LP
643 663 See \fBattributes\fR(5) for descriptions of the following attributes:
644 664 .sp
645 665
646 666 .sp
647 667 .TS
648 668 box;
649 669 c | c
650 670 l | l .
651 671 ATTRIBUTE TYPE ATTRIBUTE VALUE
652 672 _
653 673 Interface Stability See below.
654 674 .TE
655 675
656 676 .sp
657 677 .LP
658 678 Invocation is evolving. Human readable output is unstable.
659 679 .SH SEE ALSO
660 680 .sp
661 681 .LP
662 682 \fBdate\fR(1), \fBsar\fR(1), \fBsar\fR(1M), \fBmpstat\fR(1M), \fBvmstat\fR(1M),
663 683 \fBtime\fR(2), \fBattributes\fR(5), \fBscsi_vhci\fR(7D)
664 684 .SH NOTES
665 685 .sp
666 686 .LP
667 687 The sum of \fBCPU\fR utilization might vary slightly from 100 because of
668 688 rounding errors in the production of a percentage figure.
669 689 .sp
670 690 .LP
671 691 The \fBsvc_t\fR response time is not particularly significant when the
672 692 \fBI/0\fR (\fBr/s\fR+\fBw/s\fR) rates are under 0.5 per second. Harmless spikes
673 693 are fairly normal in such cases.
674 694 .sp
675 695 .LP
676 696 The \fBmpstat\fR utility reports the same \fBdt\fR, \fBusr\fR, and \fBsys\fR
677 697 statistics. See \fBmpstat\fR(1M) for more information.
678 698 .sp
679 699 .LP
680 700 When executed in a \fBzone\fR and if the pools facility is active,
681 701 \fBiostat\fR(1M) will only provide information for those processors in the
682 702 processor set of the pool to which the \fBzone\fR is bound.
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