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3b0c1131ef
Some users might want to scrub only new data because they would like to know if the new write wasn't corrupted. This PR adds possibility scrub only newly written data. This introduces new `last_scrubbed_txg` property, indicating the transaction group (TXG) up to which the most recent scrub operation has checked and repaired the dataset, so users can run scrub only from the last saved point. We use a scn_max_txg and scn_min_txg which are already built into scrub, to accomplish that. Reviewed-by: Allan Jude <allan@klarasystems.com> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Mariusz Zaborski <mariusz.zaborski@klarasystems.com> Sponsored-By: Wasabi Technology, Inc. Sponsored-By: Klara Inc. Closes #16301
163 lines
4.9 KiB
Groff
163 lines
4.9 KiB
Groff
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.\" CDDL HEADER END
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.\"
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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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.\"
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.Dd November 18, 2024
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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 Ns Fl e | Ns Fl p | Fl s Ns | Fl C Ns
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.Op Fl w
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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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.It Fl C
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Continue scrub from last saved txg (see zpool
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.Sy last_scrubbed_txg
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property).
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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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