FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/man/man8/zpool-events.8

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    .\" Copyright (c) 2012 Cyril Plisko. All Rights Reserved.
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    .Dd May 27, 2021
    .Dt ZPOOL-EVENTS 8
    .Os
    .
    .Sh NAME
    .Nm zpool-events
    .Nd list recent events generated by kernel
    .Sh SYNOPSIS
    .Nm zpool
    .Cm events
    .Op Fl vHf
    .Op Ar pool
    .Nm zpool
    .Cm events
    .Fl c
    .
    .Sh DESCRIPTION
    Lists all recent events generated by the ZFS kernel modules.
    These events are consumed by the
    .Xr zed 8
    and used to automate administrative tasks such as replacing a failed device
    with a hot spare.
    For more information about the subclasses and event payloads
    that can be generated see
    .Sx EVENTS
    and the following sections.
    .
    .Sh OPTIONS
    .Bl -tag -compact -width Ds
    .It Fl c
    Clear all previous events.
    .It Fl f
    Follow mode.
    .It Fl H
    Scripted mode.
    Do not display headers, and separate fields by a
    single tab instead of arbitrary space.
    .It Fl v
    Print the entire payload for each event.
    .El
    .
    .Sh EVENTS
    These are the different event subclasses.
    The full event name would be
    .Sy ereport.fs.zfs.\& Ns Em SUBCLASS ,
    but only the last part is listed here.
    .Pp
    .Bl -tag -compact -width "vdev.bad_guid_sum"
    .It Sy checksum
    Issued when a checksum error has been detected.
    .It Sy io
    Issued when there is an I/O error in a vdev in the pool.
    .It Sy data
    Issued when there have been data errors in the pool.
    .It Sy deadman
    Issued when an I/O request is determined to be "hung", this can be caused
    by lost completion events due to flaky hardware or drivers.
    See
    .Sy zfs_deadman_failmode
    in
    .Xr zfs 4
    for additional information regarding "hung" I/O detection and configuration.
    .It Sy delay
    Issued when a completed I/O request exceeds the maximum allowed time
    specified by the
    .Sy zio_slow_io_ms
    module parameter.
    This can be an indicator of problems with the underlying storage device.
    The number of delay events is ratelimited by the
    .Sy zfs_slow_io_events_per_second
    module parameter.
   .It Sy config
   Issued every time a vdev change have been done to the pool.
   .It Sy zpool
   Issued when a pool cannot be imported.
   .It Sy zpool.destroy
   Issued when a pool is destroyed.
   .It Sy zpool.export
   Issued when a pool is exported.
   .It Sy zpool.import
   Issued when a pool is imported.
   .It Sy zpool.reguid
   Issued when a REGUID (new unique identifier for the pool have been regenerated)
   have been detected.
   .It Sy vdev.unknown
   Issued when the vdev is unknown.
   Such as trying to clear device errors on a vdev that have failed/been kicked
   from the system/pool and is no longer available.
   .It Sy vdev.open_failed
   Issued when a vdev could not be opened (because it didn't exist for example).
   .It Sy vdev.corrupt_data
   Issued when corrupt data have been detected on a vdev.
   .It Sy vdev.no_replicas
   Issued when there are no more replicas to sustain the pool.
   This would lead to the pool being
   .Em DEGRADED .
   .It Sy vdev.bad_guid_sum
   Issued when a missing device in the pool have been detected.
   .It Sy vdev.too_small
   Issued when the system (kernel) have removed a device, and ZFS
   notices that the device isn't there any more.
   This is usually followed by a
   .Sy probe_failure
   event.
   .It Sy vdev.bad_label
   Issued when the label is OK but invalid.
   .It Sy vdev.bad_ashift
   Issued when the ashift alignment requirement has increased.
   .It Sy vdev.remove
   Issued when a vdev is detached from a mirror (or a spare detached from a
   vdev where it have been used to replace a failed drive - only works if
   the original drive have been re-added).
   .It Sy vdev.clear
   Issued when clearing device errors in a pool.
   Such as running
   .Nm zpool Cm clear
   on a device in the pool.
   .It Sy vdev.check
   Issued when a check to see if a given vdev could be opened is started.
   .It Sy vdev.spare
   Issued when a spare have kicked in to replace a failed device.
   .It Sy vdev.autoexpand
   Issued when a vdev can be automatically expanded.
   .It Sy io_failure
   Issued when there is an I/O failure in a vdev in the pool.
   .It Sy probe_failure
   Issued when a probe fails on a vdev.
   This would occur if a vdev
   have been kicked from the system outside of ZFS (such as the kernel
   have removed the device).
   .It Sy log_replay
   Issued when the intent log cannot be replayed.
   The can occur in the case of a missing or damaged log device.
   .It Sy resilver.start
   Issued when a resilver is started.
   .It Sy resilver.finish
   Issued when the running resilver have finished.
   .It Sy scrub.start
   Issued when a scrub is started on a pool.
   .It Sy scrub.finish
   Issued when a pool has finished scrubbing.
   .It Sy scrub.abort
   Issued when a scrub is aborted on a pool.
   .It Sy scrub.resume
   Issued when a scrub is resumed on a pool.
   .It Sy scrub.paused
   Issued when a scrub is paused on a pool.
   .It Sy bootfs.vdev.attach
   .El
   .
   .Sh PAYLOADS
   This is the payload (data, information) that accompanies an
   event.
   .Pp
   For
   .Xr zed 8 ,
   these are set to uppercase and prefixed with
   .Sy ZEVENT_ .
   .Pp
   .Bl -tag -compact -width "vdev_cksum_errors"
   .It Sy pool
   Pool name.
   .It Sy pool_failmode
   Failmode -
   .Sy wait ,
   .Sy continue ,
   or
   .Sy panic .
   See the
   .Sy failmode
   property in
   .Xr zpoolprops 7
   for more information.
   .It Sy pool_guid
   The GUID of the pool.
   .It Sy pool_context
   The load state for the pool (0=none, 1=open, 2=import, 3=tryimport, 4=recover
   5=error).
   .It Sy vdev_guid
   The GUID of the vdev in question (the vdev failing or operated upon with
   .Nm zpool Cm clear ,
   etc.).
   .It Sy vdev_type
   Type of vdev -
   .Sy disk ,
   .Sy file ,
   .Sy mirror ,
   etc.
   See the
   .Sy Virtual Devices
   section of
   .Xr zpoolconcepts 7
   for more information on possible values.
   .It Sy vdev_path
   Full path of the vdev, including any
   .Em -partX .
   .It Sy vdev_devid
   ID of vdev (if any).
   .It Sy vdev_fru
   Physical FRU location.
   .It Sy vdev_state
   State of vdev (0=uninitialized, 1=closed, 2=offline, 3=removed, 4=failed to
   open, 5=faulted, 6=degraded, 7=healthy).
   .It Sy vdev_ashift
   The ashift value of the vdev.
   .It Sy vdev_complete_ts
   The time the last I/O request completed for the specified vdev.
   .It Sy vdev_delta_ts
   The time since the last I/O request completed for the specified vdev.
   .It Sy vdev_spare_paths
   List of spares, including full path and any
   .Em -partX .
   .It Sy vdev_spare_guids
   GUID(s) of spares.
   .It Sy vdev_read_errors
   How many read errors that have been detected on the vdev.
   .It Sy vdev_write_errors
   How many write errors that have been detected on the vdev.
   .It Sy vdev_cksum_errors
   How many checksum errors that have been detected on the vdev.
   .It Sy parent_guid
   GUID of the vdev parent.
   .It Sy parent_type
   Type of parent.
   See
   .Sy vdev_type .
   .It Sy parent_path
   Path of the vdev parent (if any).
   .It Sy parent_devid
   ID of the vdev parent (if any).
   .It Sy zio_objset
   The object set number for a given I/O request.
   .It Sy zio_object
   The object number for a given I/O request.
   .It Sy zio_level
   The indirect level for the block.
   Level 0 is the lowest level and includes data blocks.
   Values > 0 indicate metadata blocks at the appropriate level.
   .It Sy zio_blkid
   The block ID for a given I/O request.
   .It Sy zio_err
   The error number for a failure when handling a given I/O request,
   compatible with
   .Xr errno 3
   with the value of
   .Sy EBADE
   used to indicate a ZFS checksum error.
   .It Sy zio_offset
   The offset in bytes of where to write the I/O request for the specified vdev.
   .It Sy zio_size
   The size in bytes of the I/O request.
   .It Sy zio_flags
   The current flags describing how the I/O request should be handled.
   See the
   .Sy I/O FLAGS
   section for the full list of I/O flags.
   .It Sy zio_stage
   The current stage of the I/O in the pipeline.
   See the
   .Sy I/O STAGES
   section for a full list of all the I/O stages.
   .It Sy zio_pipeline
   The valid pipeline stages for the I/O.
   See the
   .Sy I/O STAGES
   section for a full list of all the I/O stages.
   .It Sy zio_delay
   The time elapsed (in nanoseconds) waiting for the block layer to complete the
   I/O request.
   Unlike
   .Sy zio_delta ,
   this does not include any vdev queuing time and is
   therefore solely a measure of the block layer performance.
   .It Sy zio_timestamp
   The time when a given I/O request was submitted.
   .It Sy zio_delta
   The time required to service a given I/O request.
   .It Sy prev_state
   The previous state of the vdev.
   .It Sy cksum_expected
   The expected checksum value for the block.
   .It Sy cksum_actual
   The actual checksum value for an errant block.
   .It Sy cksum_algorithm
   Checksum algorithm used.
   See
   .Xr zfsprops 7
   for more information on the available checksum algorithms.
   .It Sy cksum_byteswap
   Whether or not the data is byteswapped.
   .It Sy bad_ranges
   .No [\& Ns Ar start , end )
   pairs of corruption offsets.
   Offsets are always aligned on a 64-bit boundary,
   and can include some gaps of non-corruption.
   (See
   .Sy bad_ranges_min_gap )
   .It Sy bad_ranges_min_gap
   In order to bound the size of the
   .Sy bad_ranges
   array, gaps of non-corruption
   less than or equal to
   .Sy bad_ranges_min_gap
   bytes have been merged with
   adjacent corruption.
   Always at least 8 bytes, since corruption is detected on a 64-bit word basis.
   .It Sy bad_range_sets
   This array has one element per range in
   .Sy bad_ranges .
   Each element contains
   the count of bits in that range which were clear in the good data and set
   in the bad data.
   .It Sy bad_range_clears
   This array has one element per range in
   .Sy bad_ranges .
   Each element contains
   the count of bits for that range which were set in the good data and clear in
   the bad data.
   .It Sy bad_set_bits
   If this field exists, it is an array of
   .Pq Ar bad data No & ~( Ns Ar good data ) ;
   that is, the bits set in the bad data which are cleared in the good data.
   Each element corresponds a byte whose offset is in a range in
   .Sy bad_ranges ,
   and the array is ordered by offset.
   Thus, the first element is the first byte in the first
   .Sy bad_ranges
   range, and the last element is the last byte in the last
   .Sy bad_ranges
   range.
   .It Sy bad_cleared_bits
   Like
   .Sy bad_set_bits ,
   but contains
   .Pq Ar good data No & ~( Ns Ar bad data ) ;
   that is, the bits set in the good data which are cleared in the bad data.
   .It Sy bad_set_histogram
   If this field exists, it is an array of counters.
   Each entry counts bits set in a particular bit of a big-endian uint64 type.
   The first entry counts bits
   set in the high-order bit of the first byte, the 9th byte, etc, and the last
   entry counts bits set of the low-order bit of the 8th byte, the 16th byte, etc.
   This information is useful for observing a stuck bit in a parallel data path,
   such as IDE or parallel SCSI.
   .It Sy bad_cleared_histogram
   If this field exists, it is an array of counters.
   Each entry counts bit clears in a particular bit of a big-endian uint64 type.
   The first entry counts bits
   clears of the high-order bit of the first byte, the 9th byte, etc, and the
   last entry counts clears of the low-order bit of the 8th byte, the 16th byte,
   etc.
   This information is useful for observing a stuck bit in a parallel data
   path, such as IDE or parallel SCSI.
   .El
   .
   .Sh I/O STAGES
   The ZFS I/O pipeline is comprised of various stages which are defined below.
   The individual stages are used to construct these basic I/O
   operations: Read, Write, Free, Claim, and Ioctl.
   These stages may be
   set on an event to describe the life cycle of a given I/O request.
   .Pp
   .TS
   tab(:);
   l l l .
   Stage:Bit Mask:Operations
   _:_:_
   ZIO_STAGE_OPEN:0x00000001:RWFCI
   
   ZIO_STAGE_READ_BP_INIT:0x00000002:R----
   ZIO_STAGE_WRITE_BP_INIT:0x00000004:-W---
   ZIO_STAGE_FREE_BP_INIT:0x00000008:--F--
   ZIO_STAGE_ISSUE_ASYNC:0x00000010:RWF--
   ZIO_STAGE_WRITE_COMPRESS:0x00000020:-W---
   
   ZIO_STAGE_ENCRYPT:0x00000040:-W---
   ZIO_STAGE_CHECKSUM_GENERATE:0x00000080:-W---
   
   ZIO_STAGE_NOP_WRITE:0x00000100:-W---
   
   ZIO_STAGE_DDT_READ_START:0x00000200:R----
   ZIO_STAGE_DDT_READ_DONE:0x00000400:R----
   ZIO_STAGE_DDT_WRITE:0x00000800:-W---
   ZIO_STAGE_DDT_FREE:0x00001000:--F--
   
   ZIO_STAGE_GANG_ASSEMBLE:0x00002000:RWFC-
   ZIO_STAGE_GANG_ISSUE:0x00004000:RWFC-
   
   ZIO_STAGE_DVA_THROTTLE:0x00008000:-W---
   ZIO_STAGE_DVA_ALLOCATE:0x00010000:-W---
   ZIO_STAGE_DVA_FREE:0x00020000:--F--
   ZIO_STAGE_DVA_CLAIM:0x00040000:---C-
   
   ZIO_STAGE_READY:0x00080000:RWFCI
   
   ZIO_STAGE_VDEV_IO_START:0x00100000:RW--I
   ZIO_STAGE_VDEV_IO_DONE:0x00200000:RW--I
   ZIO_STAGE_VDEV_IO_ASSESS:0x00400000:RW--I
   
   ZIO_STAGE_CHECKSUM_VERIFY:0x00800000:R----
   
   ZIO_STAGE_DONE:0x01000000:RWFCI
   .TE
   .
   .Sh I/O FLAGS
   Every I/O request in the pipeline contains a set of flags which describe its
   function and are used to govern its behavior.
   These flags will be set in an event as a
   .Sy zio_flags
   payload entry.
   .Pp
   .TS
   tab(:);
   l l .
   Flag:Bit Mask
   _:_
   ZIO_FLAG_DONT_AGGREGATE:0x00000001
   ZIO_FLAG_IO_REPAIR:0x00000002
   ZIO_FLAG_SELF_HEAL:0x00000004
   ZIO_FLAG_RESILVER:0x00000008
   ZIO_FLAG_SCRUB:0x00000010
   ZIO_FLAG_SCAN_THREAD:0x00000020
   ZIO_FLAG_PHYSICAL:0x00000040
   
   ZIO_FLAG_CANFAIL:0x00000080
   ZIO_FLAG_SPECULATIVE:0x00000100
   ZIO_FLAG_CONFIG_WRITER:0x00000200
   ZIO_FLAG_DONT_RETRY:0x00000400
   ZIO_FLAG_DONT_CACHE:0x00000800
   ZIO_FLAG_NODATA:0x00001000
   ZIO_FLAG_INDUCE_DAMAGE:0x00002000
   
   ZIO_FLAG_IO_ALLOCATING:0x00004000
   ZIO_FLAG_IO_RETRY:0x00008000
   ZIO_FLAG_PROBE:0x00010000
   ZIO_FLAG_TRYHARD:0x00020000
   ZIO_FLAG_OPTIONAL:0x00040000
   
   ZIO_FLAG_DONT_QUEUE:0x00080000
   ZIO_FLAG_DONT_PROPAGATE:0x00100000
   ZIO_FLAG_IO_BYPASS:0x00200000
   ZIO_FLAG_IO_REWRITE:0x00400000
   ZIO_FLAG_RAW_COMPRESS:0x00800000
   ZIO_FLAG_RAW_ENCRYPT:0x01000000
   
   ZIO_FLAG_GANG_CHILD:0x02000000
   ZIO_FLAG_DDT_CHILD:0x04000000
   ZIO_FLAG_GODFATHER:0x08000000
   ZIO_FLAG_NOPWRITE:0x10000000
   ZIO_FLAG_REEXECUTED:0x20000000
   ZIO_FLAG_DELEGATED:0x40000000
   ZIO_FLAG_FASTWRITE:0x80000000
   .TE
   .
   .Sh SEE ALSO
   .Xr zfs 4 ,
   .Xr zed 8 ,
   .Xr zpool-wait 8

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