966 lines
16 KiB
Groff
966 lines
16 KiB
Groff
'\" te
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.\" Copyright (c) 2013 by Turbo Fredriksson <turbo@bayour.com>. All rights reserved.
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.\" Portions Copyright 2018 by Richard Elling
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.\" The contents of this file are subject to the terms of the Common Development
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.\" and Distribution License (the "License"). You may not use this file except
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.\" in compliance with the License. You can obtain a copy of the license at
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.\" usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing.
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.\"
|
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.\" See the License for the specific language governing permissions and
|
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.\" limitations under the License. When distributing Covered Code, include this
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.\" CDDL HEADER in each file and include the License file at
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.\" usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this
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.\" CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your
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.\" own identifying information:
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.\" Portions Copyright [yyyy] [name of copyright owner]
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.TH ZFS-EVENTS 5 "Oct 24, 2018"
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|
.SH NAME
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|
zfs\-events \- Events created by the ZFS filesystem.
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|
.SH DESCRIPTION
|
|
.sp
|
|
.LP
|
|
Description of the different events generated by the ZFS stack.
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|
.sp
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|
Most of these don't have any description. The events generated by ZFS
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|
have never been publicly documented. What is here is intended as a
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|
starting point to provide documentation for all possible events.
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|
.sp
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|
To view all events created since the loading of the ZFS infrastructure
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|
(i.e, "the module"), run
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|
.P
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|
.nf
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|
\fBzpool events\fR
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|
.fi
|
|
.P
|
|
to get a short list, and
|
|
.P
|
|
.nf
|
|
\fBzpool events -v\fR
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|
.fi
|
|
.P
|
|
to get a full detail of the events and what information
|
|
is available about it.
|
|
.sp
|
|
This man page lists the different subclasses that are issued
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|
in the case of an event. The full event name would be
|
|
\fIereport.fs.zfs.SUBCLASS\fR, but we only list the last
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part here.
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|
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|
.SS "EVENTS (SUBCLASS)"
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|
.sp
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|
.LP
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBchecksum\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when a checksum error has been detected.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBio\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when there is an I/O error in a vdev in the pool.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBdata\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when there have been data errors in the pool.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBdeadman\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when an I/O is determined to be "hung", this can be caused by lost
|
|
completion events due to flaky hardware or drivers. See the
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|
\fBzfs_deadman_failmode\fR module option description for additional
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|
information regarding "hung" I/O detection and configuration.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBdelay\fR
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|
.ad
|
|
.RS 12n
|
|
Issued when a completed I/O exceeds the maximum allowed time specified
|
|
by the \fBzio_slow_io_ms\fR module option. This can be an indicator of
|
|
problems with the underlying storage device. The number of delay events is
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|
ratelimited by the \fBzfs_slow_io_events_per_second\fR module parameter.
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|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBconfig.sync\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued every time a vdev change have been done to the pool.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBzpool\fR
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|
.ad
|
|
.RS 12n
|
|
Issued when a pool cannot be imported.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBzpool.destroy\fR
|
|
.ad
|
|
.RS 12n
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|
Issued when a pool is destroyed.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBzpool.export\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when a pool is exported.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBzpool.import\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when a pool is imported.
|
|
.RE
|
|
|
|
.sp
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|
.ne 2
|
|
.na
|
|
\fBzpool.reguid\fR
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|
.ad
|
|
.RS 12n
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|
Issued when a REGUID (new unique identifier for the pool have been regenerated) have been detected.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev.unknown\fR
|
|
.ad
|
|
.RS 12n
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|
Issued when the vdev is unknown. Such as trying to clear device
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|
errors on a vdev that have failed/been kicked from the system/pool
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|
and is no longer available.
|
|
.RE
|
|
|
|
.sp
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|
.ne 2
|
|
.na
|
|
\fBvdev.open_failed\fR
|
|
.ad
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|
.RS 12n
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|
Issued when a vdev could not be opened (because it didn't exist for example).
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev.corrupt_data\fR
|
|
.ad
|
|
.RS 12n
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|
Issued when corrupt data have been detected on a vdev.
|
|
.RE
|
|
|
|
.sp
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|
.ne 2
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|
.na
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|
\fBvdev.no_replicas\fR
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|
.ad
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|
.RS 12n
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|
Issued when there are no more replicas to sustain the pool.
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|
This would lead to the pool being \fIDEGRADED\fR.
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|
.RE
|
|
|
|
.sp
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|
.ne 2
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|
.na
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|
\fBvdev.bad_guid_sum\fR
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|
.ad
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|
.RS 12n
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|
Issued when a missing device in the pool have been detected.
|
|
.RE
|
|
|
|
.sp
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|
.ne 2
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|
.na
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|
\fBvdev.too_small\fR
|
|
.ad
|
|
.RS 12n
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|
Issued when the system (kernel) have removed a device, and ZFS
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|
notices that the device isn't there any more. This is usually
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followed by a \fBprobe_failure\fR event.
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.RE
|
|
|
|
.sp
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|
.ne 2
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|
.na
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|
\fBvdev.bad_label\fR
|
|
.ad
|
|
.RS 12n
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|
Issued when the label is OK but invalid.
|
|
.RE
|
|
|
|
.sp
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|
.ne 2
|
|
.na
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|
\fBvdev.bad_ashift\fR
|
|
.ad
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|
.RS 12n
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|
Issued when the ashift alignment requirement has increased.
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|
.RE
|
|
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|
.sp
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|
.ne 2
|
|
.na
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|
\fBvdev.remove\fR
|
|
.ad
|
|
.RS 12n
|
|
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 readded).
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
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|
\fBvdev.clear\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when clearing device errors in a pool. Such as running \fBzpool clear\fR
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|
on a device in the pool.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev.check\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when a check to see if a given vdev could be opened is started.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev.spare\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when a spare have kicked in to replace a failed device.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev.autoexpand\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when a vdev can be automatically expanded.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBio_failure\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when there is an I/O failure in a vdev in the pool.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
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|
\fBprobe_failure\fR
|
|
.ad
|
|
.RS 12n
|
|
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).
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBlog_replay\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when the intent log cannot be replayed. The can occur in the case
|
|
of a missing or damaged log device.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBresilver.start\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when a resilver is started.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBresilver.finish\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when the running resilver have finished.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBscrub.start\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when a scrub is started on a pool.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBscrub.finish\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when a pool has finished scrubbing.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBscrub.abort\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when a scrub is aborted on a pool.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBscrub.resume\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when a scrub is resumed on a pool.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBscrub.paused\fR
|
|
.ad
|
|
.RS 12n
|
|
Issued when a scrub is paused on a pool.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBbootfs.vdev.attach\fR
|
|
.ad
|
|
.RS 12n
|
|
.RE
|
|
|
|
.SS "PAYLOADS"
|
|
.sp
|
|
.LP
|
|
This is the payload (data, information) that accompanies an
|
|
event.
|
|
.sp
|
|
For
|
|
.BR zed (8),
|
|
these are set to uppercase and prefixed with \fBZEVENT_\fR.
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBpool\fR
|
|
.ad
|
|
.RS 12n
|
|
Pool name.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBpool_failmode\fR
|
|
.ad
|
|
.RS 12n
|
|
Failmode - \fBwait\fR, \fBcontinue\fR or \fBpanic\fR.
|
|
See
|
|
.BR zpool (8)
|
|
(\fIfailmode\fR property) for more information.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBpool_guid\fR
|
|
.ad
|
|
.RS 12n
|
|
The GUID of the pool.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBpool_context\fR
|
|
.ad
|
|
.RS 12n
|
|
The load state for the pool (0=none, 1=open, 2=import, 3=tryimport, 4=recover
|
|
5=error).
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev_guid\fR
|
|
.ad
|
|
.RS 12n
|
|
The GUID of the vdev in question (the vdev failing or operated upon with
|
|
\fBzpool clear\fR etc).
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev_type\fR
|
|
.ad
|
|
.RS 12n
|
|
Type of vdev - \fBdisk\fR, \fBfile\fR, \fBmirror\fR etc. See
|
|
.BR zpool (8)
|
|
under \fBVirtual Devices\fR for more information on possible values.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev_path\fR
|
|
.ad
|
|
.RS 12n
|
|
Full path of the vdev, including any \fI-partX\fR.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev_devid\fR
|
|
.ad
|
|
.RS 12n
|
|
ID of vdev (if any).
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev_fru\fR
|
|
.ad
|
|
.RS 12n
|
|
Physical FRU location.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev_state\fR
|
|
.ad
|
|
.RS 12n
|
|
State of vdev (0=uninitialized, 1=closed, 2=offline, 3=removed, 4=failed to open, 5=faulted, 6=degraded, 7=healthy).
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev_ashift\fR
|
|
.ad
|
|
.RS 12n
|
|
The ashift value of the vdev.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev_complete_ts\fR
|
|
.ad
|
|
.RS 12n
|
|
The time the last I/O completed for the specified vdev.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev_delta_ts\fR
|
|
.ad
|
|
.RS 12n
|
|
The time since the last I/O completed for the specified vdev.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev_spare_paths\fR
|
|
.ad
|
|
.RS 12n
|
|
List of spares, including full path and any \fI-partX\fR.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev_spare_guids\fR
|
|
.ad
|
|
.RS 12n
|
|
GUID(s) of spares.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev_read_errors\fR
|
|
.ad
|
|
.RS 12n
|
|
How many read errors that have been detected on the vdev.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev_write_errors\fR
|
|
.ad
|
|
.RS 12n
|
|
How many write errors that have been detected on the vdev.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBvdev_cksum_errors\fR
|
|
.ad
|
|
.RS 12n
|
|
How many checkum errors that have been detected on the vdev.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBparent_guid\fR
|
|
.ad
|
|
.RS 12n
|
|
GUID of the vdev parent.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBparent_type\fR
|
|
.ad
|
|
.RS 12n
|
|
Type of parent. See \fBvdev_type\fR.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBparent_path\fR
|
|
.ad
|
|
.RS 12n
|
|
Path of the vdev parent (if any).
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBparent_devid\fR
|
|
.ad
|
|
.RS 12n
|
|
ID of the vdev parent (if any).
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBzio_objset\fR
|
|
.ad
|
|
.RS 12n
|
|
The object set number for a given I/O.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBzio_object\fR
|
|
.ad
|
|
.RS 12n
|
|
The object number for a given I/O.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBzio_level\fR
|
|
.ad
|
|
.RS 12n
|
|
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.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBzio_blkid\fR
|
|
.ad
|
|
.RS 12n
|
|
The block ID for a given I/O.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBzio_err\fR
|
|
.ad
|
|
.RS 12n
|
|
The errno for a failure when handling a given I/O. The errno is compatible
|
|
with \fBerrno\fR(3) with the value for EBADE (0x34) used to indicate ZFS
|
|
checksum error.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBzio_offset\fR
|
|
.ad
|
|
.RS 12n
|
|
The offset in bytes of where to write the I/O for the specified vdev.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBzio_size\fR
|
|
.ad
|
|
.RS 12n
|
|
The size in bytes of the I/O.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBzio_flags\fR
|
|
.ad
|
|
.RS 12n
|
|
The current flags describing how the I/O should be handled. See the
|
|
\fBI/O FLAGS\fR section for the full list of I/O flags.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBzio_stage\fR
|
|
.ad
|
|
.RS 12n
|
|
The current stage of the I/O in the pipeline. See the \fBI/O STAGES\fR
|
|
section for a full list of all the I/O stages.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBzio_pipeline\fR
|
|
.ad
|
|
.RS 12n
|
|
The valid pipeline stages for the I/O. See the \fBI/O STAGES\fR section for a
|
|
full list of all the I/O stages.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBzio_delay\fR
|
|
.ad
|
|
.RS 12n
|
|
The time elapsed (in nanoseconds) waiting for the block layer to complete the
|
|
I/O. Unlike \fBzio_delta\fR this does not include any vdev queuing time and is
|
|
therefore solely a measure of the block layer performance.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBzio_timestamp\fR
|
|
.ad
|
|
.RS 12n
|
|
The time when a given I/O was submitted.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBzio_delta\fR
|
|
.ad
|
|
.RS 12n
|
|
The time required to service a given I/O.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBprev_state\fR
|
|
.ad
|
|
.RS 12n
|
|
The previous state of the vdev.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBcksum_expected\fR
|
|
.ad
|
|
.RS 12n
|
|
The expected checksum value for the block.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBcksum_actual\fR
|
|
.ad
|
|
.RS 12n
|
|
The actual checksum value for an errant block.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBcksum_algorithm\fR
|
|
.ad
|
|
.RS 12n
|
|
Checksum algorithm used. See \fBzfs\fR(8) for more information on checksum
|
|
algorithms available.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBcksum_byteswap\fR
|
|
.ad
|
|
.RS 12n
|
|
Whether or not the data is byteswapped.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBbad_ranges\fR
|
|
.ad
|
|
.RS 12n
|
|
[start, end) pairs of corruption offsets. Offsets are always aligned on a
|
|
64-bit boundary, and can include some gaps of non-corruption.
|
|
(See \fBbad_ranges_min_gap\fR)
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBbad_ranges_min_gap\fR
|
|
.ad
|
|
.RS 12n
|
|
In order to bound the size of the \fBbad_ranges\fR array, gaps of non-corruption
|
|
less than or equal to \fBbad_ranges_min_gap\fR bytes have been merged with
|
|
adjacent corruption. Always at least 8 bytes, since corruption is detected
|
|
on a 64-bit word basis.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBbad_range_sets\fR
|
|
.ad
|
|
.RS 12n
|
|
This array has one element per range in \fBbad_ranges\fR. Each element contains
|
|
the count of bits in that range which were clear in the good data and set
|
|
in the bad data.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBbad_range_clears\fR
|
|
.ad
|
|
.RS 12n
|
|
This array has one element per range in \fBbad_ranges\fR. Each element contains
|
|
the count of bits for that range which were set in the good data and clear in
|
|
the bad data.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBbad_set_bits\fR
|
|
.ad
|
|
.RS 12n
|
|
If this field exists, it is an array of: (bad data & ~(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 \fBbad_ranges\fR, and the
|
|
array is ordered by offset. Thus, the first element is the first byte in the
|
|
first \fBbad_ranges\fR range, and the last element is the last byte in the last
|
|
\fBbad_ranges\fR range.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBbad_cleared_bits\fR
|
|
.ad
|
|
.RS 12n
|
|
Like \fBbad_set_bits\fR, but contains: (good data & ~(bad data)); that is,
|
|
the bits set in the good data which are cleared in the bad data.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBbad_set_histogram\fR
|
|
.ad
|
|
.RS 12n
|
|
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.
|
|
.RE
|
|
|
|
.sp
|
|
.ne 2
|
|
.na
|
|
\fBbad_cleared_histogram\fR
|
|
.ad
|
|
.RS 12n
|
|
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 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.
|
|
.RE
|
|
|
|
.SS "I/O STAGES"
|
|
.sp
|
|
.LP
|
|
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.
|
|
|
|
.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
|
|
|
|
.SS "I/O FLAGS"
|
|
.sp
|
|
.LP
|
|
Every I/O 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 an \fBzio_flags\fR payload entry.
|
|
|
|
.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
|