95 lines
2.7 KiB
Plaintext
95 lines
2.7 KiB
Plaintext
btrfs-scrub(8)
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==============
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NAME
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----
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btrfs-scrub - scrub btrfs filesystem
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SYNOPSIS
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--------
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*btrfs scrub* <subcommand> <args>
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DESCRIPTION
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-----------
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*btrfs scrub* is used to scrub a btrfs filesystem, which will read all data
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from all disks and verify checksums.
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SUBCOMMAND
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----------
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*cancel* <path>|<device>::
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If a scrub is running on the filesystem identified by <path>, cancel it.
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+
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Progress is saved in the scrub progress file and scrubbing can be resumed later
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using the scrub resume command.
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If a <device> is given, the corresponding filesystem is found and
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scrub cancel behaves as if it was called on that filesystem.
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*resume* [-BdqrR] [-c <ioprio_class> -n <ioprio_classdata>] <path>|<device>::
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Resume a canceled or interrupted scrub cycle on the filesystem identified by
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<path> or on a given <device>.
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+
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Does not start a new scrub if the last scrub finished successfully.
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`Options`
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+
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see *scrub start*.
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*start* [-BdqrRf] [-c <ioprio_class> -n <ioprio_classdata>] <path>|<device>::
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Start a scrub on all devices of the filesystem identified by <path> or on
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a single <device>. If a scrub is already running, the new one fails.
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Without options, scrub is started as a background process.
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Progress can be obtained with the *scrub status* command. Scrubbing
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involves reading all data from all disks and verifying checksums. Errors are
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corrected along the way if possible.
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The default IO priority of scrub is the idle class. The priority can be
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configured similar to the `ionice`(1) syntax using '-c' and '-n' options.
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+
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`Options`
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-B::::
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Do not background and print scrub statistics when finished.
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-d::::
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Print separate statistics for each device of the filesystem (-B only).
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-q::::
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Quiet. Omit error messages and statistics.
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-r::::
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Read only mode. Do not attempt to correct anything.
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-R::::
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Raw print mode. Print full data instead of summary.
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-c <ioprio_class>::::
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Set IO priority class (see `ionice`(1) manpage).
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-n <ioprio_classdata>::::
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Set IO priority classdata (see `ionice`(1) manpage).
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-f::::
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Force starting new scrub even if a scrub is already running.
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This is useful when scrub stat record file is damaged.
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*status* [-d] <path>|<device>::
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Show status of a running scrub for the filesystem identified by <path> or
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for the specified <device>.
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+
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If no scrub is running, show statistics of the last finished or canceled scrub
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for that filesystem or device.
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+
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`Options`
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+
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-d::::
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Print separate statistics for each device of the filesystem.
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EXIT STATUS
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-----------
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*btrfs scrub* returns a zero exit status if it succeeds. Non zero is
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returned in case of failure.
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AVAILABILITY
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------------
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*btrfs* is part of btrfs-progs.
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Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for
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further details.
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SEE ALSO
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--------
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`mkfs.btrfs`(8),
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