path: root/Documentation/btrfs-scrub.asciidoc
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authorDavid Sterba <>2015-04-14 17:37:23 +0200
committerDavid Sterba <>2015-04-14 17:41:27 +0200
commit7ffccaf0c3b4d4979d7d74bab3d79d9541a6e665 (patch)
tree1d64b306503787588d0d79ab467b95f8c6a83c99 /Documentation/btrfs-scrub.asciidoc
parent32ca2fa502c0a00a7dc40adbdae2e7b7765e6d63 (diff)
btrfs-progs: Documentaion: rename to .asciidoc
A few minor benefits: * editors set highliting according to the extensions * web access to the git repository (github) renders the .asciidoc files: * we can link to them from the wiki * the files are editable via browser and such editations can be submitted for merge easily Signed-off-by: David Sterba <>
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+btrfs-scrub - scrub btrfs filesystem
+*btrfs scrub* <subcommand> <args>
+*btrfs scrub* is used to scrub a btrfs filesystem, which will read all data
+from all disks and verify checksums.
+*cancel* <path>|<device>::
+If a scrub is running on the filesystem identified by <path>, cancel it.
+Progress is saved in the scrub progress file and scrubbing can be resumed later
+using the scrub resume command.
+If a <device> is given, the corresponding filesystem is found and
+scrub cancel behaves as if it was called on that filesystem.
+*resume* [-BdqrR] [-c <ioprio_class> -n <ioprio_classdata>] <path>|<device>::
+Resume a canceled or interrupted scrub cycle on the filesystem identified by
+<path> or on a given <device>.
+Does not start a new scrub if the last scrub finished successfully.
+see *scrub start*.
+*start* [-BdqrRf] [-c <ioprio_class> -n <ioprio_classdata>] <path>|<device>::
+Start a scrub on all devices of the filesystem identified by <path> or on
+a single <device>. If a scrub is already running, the new one fails.
+Without options, scrub is started as a background process.
+Progress can be obtained with the *scrub status* command. Scrubbing
+involves reading all data from all disks and verifying checksums. Errors are
+corrected along the way if possible.
+The default IO priority of scrub is the idle class. The priority can be
+configured similar to the `ionice`(1) syntax using '-c' and '-n' options.
+Do not background and print scrub statistics when finished.
+Print separate statistics for each device of the filesystem (-B only).
+Quiet. Omit error messages and statistics.
+Read only mode. Do not attempt to correct anything.
+Raw print mode. Print full data instead of summary.
+-c <ioprio_class>::::
+Set IO priority class (see `ionice`(1) manpage).
+-n <ioprio_classdata>::::
+Set IO priority classdata (see `ionice`(1) manpage).
+Force starting new scrub even if a scrub is already running.
+This is useful when scrub stat record file is damaged.
+*status* [-d] <path>|<device>::
+Show status of a running scrub for the filesystem identified by <path> or
+for the specified <device>.
+If no scrub is running, show statistics of the last finished or canceled scrub
+for that filesystem or device.
+Print separate statistics for each device of the filesystem.
+*btrfs scrub* returns a zero exit status if it succeeds. Non zero is
+returned in case of failure.
+*btrfs* is part of btrfs-progs.
+Please refer to the btrfs wiki for
+further details.