BTRFS-SCRUB(8) Btrfs Manual BTRFS-SCRUB(8)NAMEbtrfs-scrub - scrub btrfs filesystem
SYNOPSIS
btrfs scrub <subcommand> <args>
DESCRIPTION
btrfs scrub is used to scrub a btrfs filesystem, which will reading all
data from all disks and verifying checksums.
SUBCOMMAND
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>.
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.
Options
-B
Do not background and print scrub statistics when finished.
-d
Print separate statistics for each device of the filesystem (-B
only).
-q
Quiet. Omit error messages and statistics.
-r
Read only mode. Do not attempt to correct anything.
-R
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).
-f
force to check whether scrub has started or resumed in
userspace. this is useful when scrub stat record file is
damaged.
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.
Options
see scrub start.
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.
Options
-d
Print separate statistics for each device of the filesystem.
EXIT STATUS
btrfs scrub returns a zero exist status if it succeeds. Non zero is
returned in case of failure.
AVAILABILITY
btrfs is part of btrfs-progs. Please refer to the btrfs wiki
http://btrfs.wiki.kernel.org for further details.
SEE ALSOmkfs.btrfs(8),
Btrfs v3.14.2 05/30/2014 BTRFS-SCRUB(8)
