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BTRFS-SCRUB(8) | Btrfs Manual | BTRFS-SCRUB(8) |
NAME¶
btrfs-scrub - scrub btrfs filesystem, verify block checksumsSYNOPSIS¶
btrfs scrub <subcommand> <args>DESCRIPTION¶
btrfs scrub is used to scrub a btrfs filesystem, which will read all data and metadata blocks from all devices and verify checksums. Automatically repair corrupted blocks if there’s a correct copy available.SUBCOMMAND¶
cancel <path>|<device>If a scrub is running on the filesystem identified by
path> cancel it.
If a device is specified, the corresponding filesystem is found and
btrfs scrub cancel behaves as if it was called on that
filesystem.
resume [-BdqrR] [-c <ioprio_class> -n
<ioprio_classdata>] <path>|<device>
Resume a cancelled or interrupted scrub 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.
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.
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
status [-d] <path>|<device>
do not background and print scrub statistics when
finished
-d
print separate statistics for each device of the
filesystem ( -B only) at the end
-q
be quiet, omit error messages and statistics
-r
run in read-only mode, do not attempt to correct
anything, can be run on a read-only filesystem
-R
print raw statistics per-device instead of a
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 starting new scrub even if a scrub is already
running, this can useful when scrub status file is damaged and reports a
running scrub although it is not, but should not normally be necessary
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 cancelled scrub
for that filesystem or device.
Options
-d
print separate statistics for each device of the
filesystem
EXIT STATUS¶
btrfs scrub returns a zero exit 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 ALSO¶
mkfs.btrfs(8), ionice(1)10/02/2016 | Btrfs v4.7.3 |