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fa7b2390d4
Scan process may skip blocks based on their birth time, DVA, etc.
Traditionally those blocks were accounted as issued, that caused
reporting of hugely over-inflated numbers, having nothing to do
with actual disk I/O. This change utilizes never used field in
struct dsl_scan_phys to account such skipped bytes, allowing to
report how much data were actually scrubbed/resilvered and what
is the actual I/O speed. While formally it is an on-disk format
change, it should be compatible both ways, so should not need a
feature flag.
This should partially address the same issue as c85ac731a0, but
from a different perspective, complementing it.
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Akash B <akash-b@hpe.com>
Signed-off-by: Alexander Motin <mav@FreeBSD.org>
Sponsored by: iXsystems, Inc.
Closes #15007
160 lines
4.8 KiB
Groff
160 lines
4.8 KiB
Groff
.\"
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.\" CDDL HEADER START
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.\" The contents of this file are subject to the terms of the
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.\" Common Development and Distribution License (the "License").
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.\" CDDL HEADER END
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.\" Copyright (c) 2007, Sun Microsystems, Inc. All Rights Reserved.
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.\" Copyright (c) 2012, 2018 by Delphix. All rights reserved.
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.\" Copyright (c) 2012 Cyril Plisko. All Rights Reserved.
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.\" Copyright (c) 2017 Datto Inc.
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.\" Copyright (c) 2018, 2021 George Melikov. All Rights Reserved.
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.\" Copyright 2017 Nexenta Systems, Inc.
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.\" Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
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.Dd June 22, 2023
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.Dt ZPOOL-SCRUB 8
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.Os
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.
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.Sh NAME
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.Nm zpool-scrub
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.Nd begin or resume scrub of ZFS storage pools
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.Sh SYNOPSIS
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.Nm zpool
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.Cm scrub
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.Op Fl s Ns | Ns Fl p
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.Op Fl w
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.Op Fl e
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.Ar pool Ns …
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.
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.Sh DESCRIPTION
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Begins a scrub or resumes a paused scrub.
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The scrub examines all data in the specified pools to verify that it checksums
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correctly.
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For replicated
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.Pq mirror, raidz, or draid
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devices, ZFS automatically repairs any damage discovered during the scrub.
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The
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.Nm zpool Cm status
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command reports the progress of the scrub and summarizes the results of the
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scrub upon completion.
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.Pp
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Scrubbing and resilvering are very similar operations.
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The difference is that resilvering only examines data that ZFS knows to be out
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of date
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.Po
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for example, when attaching a new device to a mirror or replacing an existing
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device
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.Pc ,
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whereas scrubbing examines all data to discover silent errors due to hardware
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faults or disk failure.
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.Pp
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When scrubbing a pool with encrypted filesystems the keys do not need to be
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loaded.
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However, if the keys are not loaded and an unrepairable checksum error is
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detected the file name cannot be included in the
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.Nm zpool Cm status Fl v
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verbose error report.
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.Pp
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Because scrubbing and resilvering are I/O-intensive operations, ZFS only allows
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one at a time.
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.Pp
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A scrub is split into two parts: metadata scanning and block scrubbing.
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The metadata scanning sorts blocks into large sequential ranges which can then
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be read much more efficiently from disk when issuing the scrub I/O.
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.Pp
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If a scrub is paused, the
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.Nm zpool Cm scrub
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resumes it.
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If a resilver is in progress, ZFS does not allow a scrub to be started until the
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resilver completes.
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.Pp
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Note that, due to changes in pool data on a live system, it is possible for
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scrubs to progress slightly beyond 100% completion.
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During this period, no completion time estimate will be provided.
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.
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.Sh OPTIONS
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.Bl -tag -width "-s"
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.It Fl s
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Stop scrubbing.
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.It Fl p
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Pause scrubbing.
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Scrub pause state and progress are periodically synced to disk.
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If the system is restarted or pool is exported during a paused scrub,
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even after import, scrub will remain paused until it is resumed.
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Once resumed the scrub will pick up from the place where it was last
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checkpointed to disk.
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To resume a paused scrub issue
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.Nm zpool Cm scrub
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or
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.Nm zpool Cm scrub
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.Fl e
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again.
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.It Fl w
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Wait until scrub has completed before returning.
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.It Fl e
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Only scrub files with known data errors as reported by
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.Nm zpool Cm status Fl v .
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The pool must have been scrubbed at least once with the
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.Sy head_errlog
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feature enabled to use this option.
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Error scrubbing cannot be run simultaneously with regular scrubbing or
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resilvering, nor can it be run when a regular scrub is paused.
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.El
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.Sh EXAMPLES
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.Ss Example 1
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Status of pool with ongoing scrub:
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.sp
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.Bd -literal -compact
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.No # Nm zpool Cm status
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...
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scan: scrub in progress since Sun Jul 25 16:07:49 2021
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403M / 405M scanned at 100M/s, 68.4M / 405M issued at 10.0M/s
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0B repaired, 16.91% done, 00:00:04 to go
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...
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.Ed
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.Pp
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Where metadata which references 403M of file data has been
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scanned at 100M/s, and 68.4M of that file data has been
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scrubbed sequentially at 10.0M/s.
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.Sh PERIODIC SCRUB
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On machines using systemd, scrub timers can be enabled on per-pool basis.
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.Nm weekly
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and
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.Nm monthly
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timer units are provided.
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.Bl -tag -width Ds
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.It Xo
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.Xc
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.Nm systemctl
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.Cm enable
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.Cm zfs-scrub-\fIweekly\fB@\fIrpool\fB.timer
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.Cm --now
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.It Xo
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.Xc
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.Nm systemctl
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.Cm enable
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.Cm zfs-scrub-\fImonthly\fB@\fIotherpool\fB.timer
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.Cm --now
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.El
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.
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.Sh SEE ALSO
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.Xr systemd.timer 5 ,
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.Xr zpool-iostat 8 ,
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.Xr zpool-resilver 8 ,
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.Xr zpool-status 8
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