mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-25 23:52:17 +00:00
1afe51d22d
Replace **bold** or ``quoted`` with :command:`line ...` that is supposed to be used verbatim. Signed-off-by: David Sterba <dsterba@suse.com>
170 lines
5.7 KiB
ReStructuredText
170 lines
5.7 KiB
ReStructuredText
btrfs-scrub(8)
|
|
==============
|
|
|
|
SYNOPSIS
|
|
--------
|
|
|
|
**btrfs scrub** <subcommand> <args>
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
|
|
.. include:: ch-scrub-intro.rst
|
|
|
|
SUBCOMMAND
|
|
----------
|
|
|
|
cancel <path>|<device>
|
|
If a scrub is running on the filesystem identified by *path* or
|
|
*device*, cancel it.
|
|
|
|
If a *device* is specified, the corresponding filesystem is found and
|
|
:command:`btrfs scrub cancel` behaves as if it was called on that filesystem.
|
|
The progress is saved in the status file so :command:`btrfs scrub resume` can
|
|
continue from the last position.
|
|
|
|
resume [-BdqrR] <path>|<device>
|
|
Resume a cancelled or interrupted scrub on the filesystem identified by
|
|
*path* or on a given *device*. The starting point is read from the
|
|
status file if it exists.
|
|
|
|
This does not start a new scrub if the last scrub finished successfully.
|
|
|
|
``Options``
|
|
|
|
see :command:`scrub start`.
|
|
|
|
start [-BdrRf] <path>|<device>
|
|
Start a scrub on all devices of the mounted filesystem identified by
|
|
*path* or on a single *device*. If a scrub is already running, the new
|
|
one will not start. A device of an unmounted filesystem cannot be
|
|
scrubbed this way.
|
|
|
|
Without options, scrub is started as a background process. The
|
|
automatic repairs of damaged copies are performed by default for block
|
|
group profiles with redundancy. No-repair can be enabled by option *-r*.
|
|
|
|
``Options``
|
|
|
|
-B
|
|
do not background and print scrub statistics when finished
|
|
-d
|
|
print separate statistics for each device of the filesystem
|
|
(*-B* only) at the end
|
|
-r
|
|
run in read-only mode, do not attempt to correct anything, can
|
|
be run on a read-only filesystem
|
|
-R
|
|
raw print mode, print full data instead of summary
|
|
-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
|
|
|
|
``Deprecated options``
|
|
|
|
-c <ioprio_class>
|
|
set IO priority class (see ``ionice(1)`` manpage) if the IO
|
|
scheduler configured for the device supports ionice. This is
|
|
not supported byg BFQ or Kyber but is *not* supported by
|
|
mq-deadline.
|
|
-n <ioprio_classdata>
|
|
set IO priority classdata (see ``ionice(1)`` manpage)
|
|
-q
|
|
(deprecated) alias for global *-q* option
|
|
|
|
status [options] <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
|
|
cancelled scrub for that filesystem or device.
|
|
|
|
``Options``
|
|
|
|
-d
|
|
print separate statistics for each device of the filesystem
|
|
-R
|
|
print all raw statistics without postprocessing as returned by
|
|
the status ioctl
|
|
--raw
|
|
print all numbers raw values in bytes without the *B* suffix
|
|
--human-readable
|
|
print human friendly numbers, base 1024, this is the default
|
|
--iec
|
|
select the 1024 base for the following options, according to
|
|
the IEC standard
|
|
--si
|
|
select the 1000 base for the following options, according to the SI standard
|
|
--kbytes
|
|
show sizes in KiB, or kB with --si
|
|
--mbytes
|
|
show sizes in MiB, or MB with --si
|
|
--gbytes
|
|
show sizes in GiB, or GB with --si
|
|
--tbytes
|
|
show sizes in TiB, or TB with --si
|
|
|
|
A status on a filesystem without any error looks like the following:
|
|
|
|
.. code-block:: none
|
|
|
|
# btrfs scrub start /
|
|
# btrfs scrub status /
|
|
UUID: 76fac721-2294-4f89-a1af-620cde7a1980
|
|
Scrub started: Wed Apr 10 12:34:56 2023
|
|
Status: running
|
|
Duration: 0:00:05
|
|
Time left: 0:00:05
|
|
ETA: Wed Apr 10 12:35:01 2023
|
|
Total to scrub: 28.32GiB
|
|
Bytes scrubbed: 13.76GiB (48.59%)
|
|
Rate: 2.75GiB/s
|
|
Error summary: no errors found
|
|
|
|
With some errors found:
|
|
|
|
.. code-block:: none
|
|
|
|
Error summary: csum=72
|
|
Corrected: 2
|
|
Uncorrectable: 72
|
|
Unverified: 0
|
|
|
|
* *Corrected* -- number of bad blocks that were repaired from another copy
|
|
* *Uncorrectable* -- errors detected at read time but not possible to repair from other copy
|
|
* *Unverified* -- transient errors, first read failed but a retry
|
|
succeeded, may be affected by lower layers that group or split IO requests
|
|
* *Error summary* -- followed by a more detailed list of errors found
|
|
|
|
* *csum* -- checksum mismatch
|
|
* *super* -- super block errors, unless the error is fixed
|
|
immediately, the next commit will overwrite superblock
|
|
* *verify* -- metadata block header errors
|
|
* *read* -- blocks can't be read due to IO errors
|
|
|
|
EXIT STATUS
|
|
-----------
|
|
|
|
**btrfs scrub** returns a zero exit status if it succeeds. Non zero is
|
|
returned in case of failure:
|
|
|
|
1
|
|
scrub couldn't be performed
|
|
2
|
|
there is nothing to resume
|
|
3
|
|
scrub found uncorrectable errors
|
|
|
|
AVAILABILITY
|
|
------------
|
|
|
|
**btrfs** is part of btrfs-progs. Please refer to the documentation at
|
|
`https://btrfs.readthedocs.io <https://btrfs.readthedocs.io>`_.
|
|
|
|
SEE ALSO
|
|
--------
|
|
|
|
:doc:`mkfs.btrfs(8)<mkfs.btrfs>`
|