man/man5/zfs-events.5

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  15 .TH ZFS-EVENTS 5 "Jun 6, 2015"
  16 .SH NAME
  17 zfs\-events \- Events created by the ZFS filesystem.
  18 .SH DESCRIPTION
  19 .sp
  20 .LP
  21 Description of the different events generated by the ZFS stack.
  22 .sp
  23 Most of these don't have any description. The events generated by ZFS
  24 have never been publicly documented.  What is here is intended as a
  25 starting point to provide documentation for all possible events.
  26 .sp
  27 To view all events created since the loading of the ZFS infrastructure
  28 (i.e, "the module"), run
  29 .P
  30 .nf
  31 \fBzpool events\fR
  32 .fi
  33 .P
  34 to get a short list, and
  35 .P
  36 .nf
  37 \fBzpool events -v\fR
  38 .fi
  39 .P
  40 to get a full detail of the events and what information
  41 is available about it.
  42 .sp
  43 This man page lists the different subclasses that are issued
  44 in the case of an event. The full event name would be
  45 \fIereport.fs.zfs.SUBCLASS\fR, but we only list the last
  46 part here.
  47
  48 .SS "EVENTS (SUBCLASS)"
  49 .sp
  50 .LP
  51
  52 .sp
  53 .ne 2
  54 .na
  55 \fBchecksum\fR
  56 .ad
  57 .RS 12n
  58 Issued when a checksum error have been detected.
  59 .RE
  60
  61 .sp
  62 .ne 2
  63 .na
  64 \fBio\fR
  65 .ad
  66 .RS 12n
  67 Issued when there is an I/O error in a vdev in the pool.
  68 .RE
  69
  70 .sp
  71 .ne 2
  72 .na
  73 \fBdata\fR
  74 .ad
  75 .RS 12n
  76 Issued when there have been data errors in the pool.
  77 .RE
  78
  79 .sp
  80 .ne 2
  81 .na
  82 \fBdelay\fR
  83 .ad
  84 .RS 12n
  85 Issued when an I/O was slow to complete as defined by the zio_delay_max module
  86 option.
  87 .RE
  88
  89 .sp
  90 .ne 2
  91 .na
  92 \fBconfig.sync\fR
  93 .ad
  94 .RS 12n
  95 Issued every time a vdev change have been done to the pool.
  96 .RE
  97
  98 .sp
  99 .ne 2
 100 .na
 101 \fBzpool\fR
 102 .ad
 103 .RS 12n
 104 Issued when a pool cannot be imported.
 105 .RE
 106
 107 .sp
 108 .ne 2
 109 .na
 110 \fBzpool.destroy\fR
 111 .ad
 112 .RS 12n
 113 Issued when a pool is destroyed.
 114 .RE
 115
 116 .sp
 117 .ne 2
 118 .na
 119 \fBzpool.export\fR
 120 .ad
 121 .RS 12n
 122 Issued when a pool is exported.
 123 .RE
 124
 125 .sp
 126 .ne 2
 127 .na
 128 \fBzpool.import\fR
 129 .ad
 130 .RS 12n
 131 Issued when a pool is imported.
 132 .RE
 133
 134 .sp
 135 .ne 2
 136 .na
 137 \fBzpool.reguid\fR
 138 .ad
 139 .RS 12n
 140 Issued when a REGUID (new unique identifier for the pool have been regenerated) have been detected.
 141 .RE
 142
 143 .sp
 144 .ne 2
 145 .na
 146 \fBvdev.unknown\fR
 147 .ad
 148 .RS 12n
 149 Issued when the vdev is unknown. Such as trying to clear device
 150 errors on a vdev that have failed/been kicked from the system/pool
 151 and is no longer available.
 152 .RE
 153
 154 .sp
 155 .ne 2
 156 .na
 157 \fBvdev.open_failed\fR
 158 .ad
 159 .RS 12n
 160 Issued when a vdev could not be opened (because it didn't exist for example).
 161 .RE
 162
 163 .sp
 164 .ne 2
 165 .na
 166 \fBvdev.corrupt_data\fR
 167 .ad
 168 .RS 12n
 169 Issued when corrupt data have been detected on a vdev.
 170 .RE
 171
 172 .sp
 173 .ne 2
 174 .na
 175 \fBvdev.no_replicas\fR
 176 .ad
 177 .RS 12n
 178 Issued when there are no more replicas to sustain the pool.
 179 This would lead to the pool being \fIDEGRADED\fR.
 180 .RE
 181
 182 .sp
 183 .ne 2
 184 .na
 185 \fBvdev.bad_guid_sum\fR
 186 .ad
 187 .RS 12n
 188 Issued when a missing device in the pool have been detected.
 189 .RE
 190
 191 .sp
 192 .ne 2
 193 .na
 194 \fBvdev.too_small\fR
 195 .ad
 196 .RS 12n
 197 Issued when the system (kernel) have removed a device, and ZFS
 198 notices that the device isn't there any more. This is usually
 199 followed by a \fBprobe_failure\fR event.
 200 .RE
 201
 202 .sp
 203 .ne 2
 204 .na
 205 \fBvdev.bad_label\fR
 206 .ad
 207 .RS 12n
 208 Issued when the label is OK but invalid.
 209 .RE
 210
 211 .sp
 212 .ne 2
 213 .na
 214 \fBvdev.bad_ashift\fR
 215 .ad
 216 .RS 12n
 217 Issued when the ashift alignment requirement has increased.
 218 .RE
 219
 220 .sp
 221 .ne 2
 222 .na
 223 \fBvdev.remove\fR
 224 .ad
 225 .RS 12n
 226 Issued when a vdev is detached from a mirror (or a spare detached from a
 227 vdev where it have been used to replace a failed drive - only works if
 228 the original drive have been readded).
 229 .RE
 230
 231 .sp
 232 .ne 2
 233 .na
 234 \fBvdev.clear\fR
 235 .ad
 236 .RS 12n
 237 Issued when clearing device errors in a pool. Such as running \fBzpool clear\fR
 238 on a device in the pool.
 239 .RE
 240
 241 .sp
 242 .ne 2
 243 .na
 244 \fBvdev.check\fR
 245 .ad
 246 .RS 12n
 247 Issued when a check to see if a given vdev could be opened is started.
 248 .RE
 249
 250 .sp
 251 .ne 2
 252 .na
 253 \fBvdev.spare\fR
 254 .ad
 255 .RS 12n
 256 Issued when a spare have kicked in to replace a failed device.
 257 .RE
 258
 259 .sp
 260 .ne 2
 261 .na
 262 \fBvdev.autoexpand\fR
 263 .ad
 264 .RS 12n
 265 Issued when a vdev can be automatically expanded.
 266 .RE
 267
 268 .sp
 269 .ne 2
 270 .na
 271 \fBio_failure\fR
 272 .ad
 273 .RS 12n
 274 Issued when there is an I/O failure in a vdev in the pool.
 275 .RE
 276
 277 .sp
 278 .ne 2
 279 .na
 280 \fBprobe_failure\fR
 281 .ad
 282 .RS 12n
 283 Issued when a probe fails on a vdev. This would occur if a vdeev
 284 have been kicked from the system outside of ZFS (such as the kernel
 285 have removed the device).
 286 .RE
 287
 288 .sp
 289 .ne 2
 290 .na
 291 \fBlog_replay\fR
 292 .ad
 293 .RS 12n
 294 Issued when the intent log cannot be replayed.  The can occur in the case
 295 of a missing or damaged log device.
 296 .RE
 297
 298 .sp
 299 .ne 2
 300 .na
 301 \fBresilver.start\fR
 302 .ad
 303 .RS 12n
 304 Issued when a resilver is started.
 305 .RE
 306
 307 .sp
 308 .ne 2
 309 .na
 310 \fBresilver.finish\fR
 311 .ad
 312 .RS 12n
 313 Issued when the running resilver have finished.
 314 .RE
 315
 316 .sp
 317 .ne 2
 318 .na
 319 \fBscrub.start\fR
 320 .ad
 321 .RS 12n
 322 Issued when a scrub is started on a pool.
 323 .RE
 324
 325 .sp
 326 .ne 2
 327 .na
 328 \fBscrub.finish\fR
 329 .ad
 330 .RS 12n
 331 Issued when a pool have finished scrubbing.
 332 .RE
 333
 334 .sp
 335 .ne 2
 336 .na
 337 \fBbootfs.vdev.attach\fR
 338 .ad
 339 .RS 12n
 340 .RE
 341
 342 .SS "PAYLOADS"
 343 .sp
 344 .LP
 345 This is the payload (data, information) that accompanies an
 346 event.
 347 .sp
 348 For
 349 .BR zed (8),
 350 these are set to uppercase and prefixed with \fBZEVENT_\fR.
 351
 352 .sp
 353 .ne 2
 354 .na
 355 \fBpool\fR
 356 .ad
 357 .RS 12n
 358 Pool name.
 359 .RE
 360
 361 .sp
 362 .ne 2
 363 .na
 364 \fBpool_failmode\fR
 365 .ad
 366 .RS 12n
 367 Failmode - \fBwait\fR, \fBcontinue\fR or \fBpanic\fR.
 368 See
 369 .BR pool (8)
 370 (\fIfailmode\fR property) for more information.
 371 .RE
 372
 373 .sp
 374 .ne 2
 375 .na
 376 \fBpool_guid\fR
 377 .ad
 378 .RS 12n
 379 The GUID of the pool.
 380 .RE
 381
 382 .sp
 383 .ne 2
 384 .na
 385 \fBpool_context\fR
 386 .ad
 387 .RS 12n
 388 The load state for the pool (0=none, 1=open, 2=import, 3=tryimport, 4=recover
 389 5=error).
 390 .RE
 391
 392 .sp
 393 .ne 2
 394 .na
 395 \fBvdev_guid\fR
 396 .ad
 397 .RS 12n
 398 The GUID of the vdev in question (the vdev failing or operated upon with
 399 \fBzpool clear\fR etc).
 400 .RE
 401
 402 .sp
 403 .ne 2
 404 .na
 405 \fBvdev_type\fR
 406 .ad
 407 .RS 12n
 408 Type of vdev - \fBdisk\fR, \fBfile\fR, \fBmirror\fR etc. See
 409 .BR zpool (8)
 410 under \fBVirtual Devices\fR for more information on possible values.
 411 .RE
 412
 413 .sp
 414 .ne 2
 415 .na
 416 \fBvdev_path\fR
 417 .ad
 418 .RS 12n
 419 Full path of the vdev, including any \fI-partX\fR.
 420 .RE
 421
 422 .sp
 423 .ne 2
 424 .na
 425 \fBvdev_devid\fR
 426 .ad
 427 .RS 12n
 428 ID of vdev (if any).
 429 .RE
 430
 431 .sp
 432 .ne 2
 433 .na
 434 \fBvdev_fru\fR
 435 .ad
 436 .RS 12n
 437 Physical FRU location.
 438 .RE
 439
 440 .sp
 441 .ne 2
 442 .na
 443 \fBvdev_state\fR
 444 .ad
 445 .RS 12n
 446 State of vdev (0=uninitialized, 1=closed, 2=offline, 3=removed, 4=failed to open, 5=faulted, 6=degraded, 7=healty).
 447 .RE
 448
 449 .sp
 450 .ne 2
 451 .na
 452 \fBvdev_ashift\fR
 453 .ad
 454 .RS 12n
 455 The ashift value of the vdev.
 456 .RE
 457
 458 .sp
 459 .ne 2
 460 .na
 461 \fBvdev_complete_ts\fR
 462 .ad
 463 .RS 12n
 464 The time the last I/O completed for the specified vdev.
 465 .RE
 466
 467 .sp
 468 .ne 2
 469 .na
 470 \fBvdev_delta_ts\fR
 471 .ad
 472 .RS 12n
 473 The time since the last I/O completed for the specified vdev.
 474 .RE
 475
 476 .sp
 477 .ne 2
 478 .na
 479 \fBvdev_spare_paths\fR
 480 .ad
 481 .RS 12n
 482 List of spares, including full path and any \fI-partX\fR.
 483 .RE
 484
 485 .sp
 486 .ne 2
 487 .na
 488 \fBvdev_spare_guids\fR
 489 .ad
 490 .RS 12n
 491 GUID(s) of spares.
 492 .RE
 493
 494 .sp
 495 .ne 2
 496 .na
 497 \fBvdev_read_errors\fR
 498 .ad
 499 .RS 12n
 500 How many read errors that have been detected on the vdev.
 501 .RE
 502
 503 .sp
 504 .ne 2
 505 .na
 506 \fBvdev_write_errors\fR
 507 .ad
 508 .RS 12n
 509 How many write errors that have been detected on the vdev.
 510 .RE
 511
 512 .sp
 513 .ne 2
 514 .na
 515 \fBvdev_cksum_errors\fR
 516 .ad
 517 .RS 12n
 518 How many checkum errors that have been detected on the vdev.
 519 .RE
 520
 521 .sp
 522 .ne 2
 523 .na
 524 \fBparent_guid\fR
 525 .ad
 526 .RS 12n
 527 GUID of the vdev parent.
 528 .RE
 529
 530 .sp
 531 .ne 2
 532 .na
 533 \fBparent_type\fR
 534 .ad
 535 .RS 12n
 536 Type of parent. See \fBvdev_type\fR.
 537 .RE
 538
 539 .sp
 540 .ne 2
 541 .na
 542 \fBparent_path\fR
 543 .ad
 544 .RS 12n
 545 Path of the vdev parent (if any).
 546 .RE
 547
 548 .sp
 549 .ne 2
 550 .na
 551 \fBparent_devid\fR
 552 .ad
 553 .RS 12n
 554 ID of the vdev parent (if any).
 555 .RE
 556
 557 .sp
 558 .ne 2
 559 .na
 560 \fBzio_objset\fR
 561 .ad
 562 .RS 12n
 563 The object set number for a given I/O.
 564 .RE
 565
 566 .sp
 567 .ne 2
 568 .na
 569 \fBzio_object\fR
 570 .ad
 571 .RS 12n
 572 The object number for a given I/O.
 573 .RE
 574
 575 .sp
 576 .ne 2
 577 .na
 578 \fBzio_level\fR
 579 .ad
 580 .RS 12n
 581 The block level for a given I/O.
 582 .RE
 583
 584 .sp
 585 .ne 2
 586 .na
 587 \fBzio_blkid\fR
 588 .ad
 589 .RS 12n
 590 The block ID for a given I/O.
 591 .RE
 592
 593 .sp
 594 .ne 2
 595 .na
 596 \fBzio_err\fR
 597 .ad
 598 .RS 12n
 599 The errno for a failure when handling a given I/O.
 600 .RE
 601
 602 .sp
 603 .ne 2
 604 .na
 605 \fBzio_offset\fR
 606 .ad
 607 .RS 12n
 608 The offset in bytes of where to write the I/O for the specified vdev.
 609 .RE
 610
 611 .sp
 612 .ne 2
 613 .na
 614 \fBzio_size\fR
 615 .ad
 616 .RS 12n
 617 The size in bytes of the I/O.
 618 .RE
 619
 620 .sp
 621 .ne 2
 622 .na
 623 \fBzio_flags\fR
 624 .ad
 625 .RS 12n
 626 The current flags describing how the I/O should be handled.  See the
 627 \fBI/O FLAGS\fR section for the full list of I/O flags.
 628 .RE
 629
 630 .sp
 631 .ne 2
 632 .na
 633 \fBzio_stage\fR
 634 .ad
 635 .RS 12n
 636 The current stage of the I/O in the pipeline.  See the \fBI/O STAGES\fR
 637 section for a full list of all the I/O stages.
 638 .RE
 639
 640 .sp
 641 .ne 2
 642 .na
 643 \fBzio_pipeline\fR
 644 .ad
 645 .RS 12n
 646 The valid pipeline stages for the I/O.  See the \fBI/O STAGES\fR section for a
 647 full list of all the I/O stages.
 648 .RE
 649
 650 .sp
 651 .ne 2
 652 .na
 653 \fBzio_delay\fR
 654 .ad
 655 .RS 12n
 656 The time in ticks (HZ) required for the block layer to service the I/O.  Unlike
 657 \fBzio_delta\fR this does not include any vdev queuing time and is therefore
 658 solely a measure of the block layer performance.  On most modern Linux systems
 659 HZ is defined as 1000 making a tick equivalent to 1 millisecond.
 660 .RE
 661
 662 .sp
 663 .ne 2
 664 .na
 665 \fBzio_timestamp\fR
 666 .ad
 667 .RS 12n
 668 The time when a given I/O was submitted.
 669 .RE
 670
 671 .sp
 672 .ne 2
 673 .na
 674 \fBzio_delta\fR
 675 .ad
 676 .RS 12n
 677 The time required to service a given I/O.
 678 .RE
 679
 680 .sp
 681 .ne 2
 682 .na
 683 \fBprev_state\fR
 684 .ad
 685 .RS 12n
 686 The previous state of the vdev.
 687 .RE
 688
 689 .sp
 690 .ne 2
 691 .na
 692 \fBcksum_expected\fR
 693 .ad
 694 .RS 12n
 695 The expected checksum value.
 696 .RE
 697
 698 .sp
 699 .ne 2
 700 .na
 701 \fBcksum_actual\fR
 702 .ad
 703 .RS 12n
 704 The actual/current checksum value.
 705 .RE
 706
 707 .sp
 708 .ne 2
 709 .na
 710 \fBcksum_algorithm\fR
 711 .ad
 712 .RS 12n
 713 Checksum algorithm used. See \fBzfs\fR(8) for more information on checksum algorithms available.
 714 .RE
 715
 716 .sp
 717 .ne 2
 718 .na
 719 \fBcksum_byteswap\fR
 720 .ad
 721 .RS 12n
 722 Checksum value is byte swapped.
 723 .RE
 724
 725 .sp
 726 .ne 2
 727 .na
 728 \fBbad_ranges\fR
 729 .ad
 730 .RS 12n
 731 Checksum bad offset ranges.
 732 .RE
 733
 734 .sp
 735 .ne 2
 736 .na
 737 \fBbad_ranges_min_gap\fR
 738 .ad
 739 .RS 12n
 740 Checksum allowed minimum gap.
 741 .RE
 742
 743 .sp
 744 .ne 2
 745 .na
 746 \fBbad_range_sets\fR
 747 .ad
 748 .RS 12n
 749 Checksum for each range the number of bits set.
 750 .RE
 751
 752 .sp
 753 .ne 2
 754 .na
 755 \fBbad_range_clears\fR
 756 .ad
 757 .RS 12n
 758 Checksum for each range the number of bits cleared.
 759 .RE
 760
 761 .sp
 762 .ne 2
 763 .na
 764 \fBbad_set_bits\fR
 765 .ad
 766 .RS 12n
 767 Checksum array of bits set.
 768 .RE
 769
 770 .sp
 771 .ne 2
 772 .na
 773 \fBbad_cleared_bits\fR
 774 .ad
 775 .RS 12n
 776 Checksum array of bits cleared.
 777 .RE
 778
 779 .sp
 780 .ne 2
 781 .na
 782 \fBbad_set_histogram\fR
 783 .ad
 784 .RS 12n
 785 Checksum histogram of set bits by bit number in a 64-bit word.
 786 .RE
 787
 788 .sp
 789 .ne 2
 790 .na
 791 \fBbad_cleared_histogram\fR
 792 .ad
 793 .RS 12n
 794 Checksum histogram of cleared bits by bit number in a 64-bit word.
 795 .RE
 796
 797 .SS "I/O STAGES"
 798 .sp
 799 .LP
 800 The ZFS I/O pipeline is comprised of various stages which are defined
 801 below.  The individual stages are used to construct these basic I/O
 802 operations: Read, Write, Free, Claim, and Ioctl.  These stages may be
 803 set on an event to describe the life cycle of a given I/O.
 804
 805 .TS
 806 tab(:);
 807 l l l .
 808 Stage:Bit Mask:Operations
 809 _:_:_
 810 ZIO_STAGE_OPEN:0x00000001:RWFCI
 811
 812 ZIO_STAGE_READ_BP_INIT:0x00000002:R----
 813 ZIO_STAGE_FREE_BP_INIT:0x00000004:--F--
 814 ZIO_STAGE_ISSUE_ASYNC:0x00000008:RWF--
 815 ZIO_STAGE_WRITE_BP_INIT:0x00000010:-W---
 816
 817 ZIO_STAGE_CHECKSUM_GENERATE:0x00000020:-W---
 818
 819 ZIO_STAGE_NOP_WRITE:0x00000040:-W---
 820
 821 ZIO_STAGE_DDT_READ_START:0x00000080:R----
 822 ZIO_STAGE_DDT_READ_DONE:0x00000100:R----
 823 ZIO_STAGE_DDT_WRITE:0x00000200:-W---
 824 ZIO_STAGE_DDT_FREE:0x00000400:--F--
 825
 826 ZIO_STAGE_GANG_ASSEMBLE:0x00000800:RWFC-
 827 ZIO_STAGE_GANG_ISSUE:0x00001000:RWFC-
 828
 829 ZIO_STAGE_DVA_ALLOCATE:0x00002000:-W---
 830 ZIO_STAGE_DVA_FREE:0x00004000:--F--
 831 ZIO_STAGE_DVA_CLAIM:0x00008000:---C-
 832
 833 ZIO_STAGE_READY:0x00010000:RWFCI
 834
 835 ZIO_STAGE_VDEV_IO_START:0x00020000:RW--I
 836 ZIO_STAGE_VDEV_IO_DONE:0x00040000:RW--I
 837 ZIO_STAGE_VDEV_IO_ASSESS:0x00080000:RW--I
 838
 839 ZIO_STAGE_CHECKSUM_VERIFY0:0x00100000:R----
 840
 841 ZIO_STAGE_DONE:0x00200000:RWFCI
 842 .TE
 843
 844 .SS "I/O FLAGS"
 845 .sp
 846 .LP
 847 Every I/O in the pipeline contains a set of flags which describe its
 848 function and are used to govern its behavior.  These flags will be set
 849 in an event as an \fBzio_flags\fR payload entry.
 850
 851 .TS
 852 tab(:);
 853 l l .
 854 Flag:Bit Mask
 855 _:_
 856 ZIO_FLAG_DONT_AGGREGATE:0x00000001
 857 ZIO_FLAG_IO_REPAIR:0x00000002
 858 ZIO_FLAG_SELF_HEAL:0x00000004
 859 ZIO_FLAG_RESILVER:0x00000008
 860 ZIO_FLAG_SCRUB:0x00000010
 861 ZIO_FLAG_SCAN_THREAD:0x00000020
 862 ZIO_FLAG_PHYSICAL:0x00000040
 863
 864 ZIO_FLAG_CANFAIL:0x00000080
 865 ZIO_FLAG_SPECULATIVE:0x00000100
 866 ZIO_FLAG_CONFIG_WRITER:0x00000200
 867 ZIO_FLAG_DONT_RETRY:0x00000400
 868 ZIO_FLAG_DONT_CACHE:0x00000800
 869 ZIO_FLAG_NODATA:0x00001000
 870 ZIO_FLAG_INDUCE_DAMAGE:0x00002000
 871
 872 ZIO_FLAG_IO_RETRY:0x00004000
 873 ZIO_FLAG_PROBE:0x00008000
 874 ZIO_FLAG_TRYHARD:0x00010000
 875 ZIO_FLAG_OPTIONAL:0x00020000
 876
 877 ZIO_FLAG_DONT_QUEUE:0x00040000
 878 ZIO_FLAG_DONT_PROPAGATE:0x00080000
 879 ZIO_FLAG_IO_BYPASS:0x00100000
 880 ZIO_FLAG_IO_REWRITE:0x00200000
 881 ZIO_FLAG_RAW:0x00400000
 882 ZIO_FLAG_GANG_CHILD:0x00800000
 883 ZIO_FLAG_DDT_CHILD:0x01000000
 884 ZIO_FLAG_GODFATHER:0x02000000
 885 ZIO_FLAG_NOPWRITE:0x04000000
 886 ZIO_FLAG_REEXECUTED:0x08000000
 887 ZIO_FLAG_DELEGATED:0x10000000
 888 ZIO_FLAG_FASTWRITE:0x20000000
 889 .TE