BTRFS-BALANCE(8)                 Btrfs Manual                 BTRFS-BALANCE(8)

NAME
       btrfs-balance - balance btrfs filesystem

SYNOPSIS
       btrfs [filesystem] balance <subcommand>|<args>

DESCRIPTION
       btrfs balance is used to balance chunks in a btrfs filesystem across
       multiple or even single device.

       See btrfs-device(8) for more details about the effect on device
       management.

SUBCOMMAND
       <path>
           Balance chunks across the devices online.

           btrfs balance <path> is deprecated, please use btrfs balance start
           command instead.

       start [options] <path>
           Balance chunks across the devices online.

           Balance and/or convert (change allocation profile of) chunks that
           passed all filters in a comma-separated list of filters for a
           particular chunk type. If filter list is not given balance all
           chunks of that type. In case none of the -d, -m or -s options is
           given balance all chunks in a filesystem.

           Options

           -d[<filters>]
               act on data chunks. See FILTERS section for details about
               <filters>.

           -m[<filters>]
               act on metadata chunks. See FILTERS section for details about
               <filters>.

           -s[<filters>]
               act on system chunks (only under -f). See FILTERS section for
               details about <filters>.

           -v
               be verbose

           -f
               force reducing of metadata integrity

       pause <path>
           Pause running balance.

       cancel <path>
           Cancel running or paused balance.

       resume <path>
           Resume interrupted balance.

       status [-v] <path>
           Show status of running or paused balance.

           If -v option is given, output will be verbose.

FILTERS
       From kernel 3.3 onwards, btrfs balance can limit its action to a subset
       of the full filesystem, and can be used to change the replication
       configuration (e.g. moving data from single to RAID-1). This
       functionality is accessed through the -d, -m or -s options to btrfs
       balance start, which filter on data, metadata and system blocks
       respectively.

       A filter has the following stucture:
           type[=params][,type=...]

       The available types are:

           profiles
               Balances only block groups with the given replication profiles.
               Parameters are a list of profile names separated by |.

           usage
               Balances only block groups with usage under the given
               percentage. The value of 0 is allowed and will clean up
               completely unused block groups, this should not require any new
               space allocated. You may want to use usage=0 in case balance is
               returnin ENOSPC and your filesystem is not too full.

           devid
               Balances only block groups which have at least one chunk on the
               given device (by btrfs device ID -- use btrfs fi show to list
               device IDs)

           drange
               Balances only block groups which overlap with the given byte
               range on any device. (Use in conjunction with "devid" to filter
               on a specific device). The parameter is a range specified as
               <start..end>.

           vrange
               Balances only block groups which overlap with the given byte
               range in the filesystem's internal virtual address space. This
               is the address space that most reports from btrfs in the kernel
               log use. The parameter is a range specified as <start..end>.

           convert
               Convert each selected block group to the given profile name
               identified by parameters.

           limit
               Process only given number of chunks, after all filters apply.
               This can be used to specifically target a chunk in connection
               with other filters (drange, vrange) or just simply limit the
               amount of work done by a single balance run.

           soft
               Takes no parameters. Only has meaning when converting between
               profiles. When doing convert from one profile to another and
               soft mode is on, restriper won't touch chunks that already have
               the target profile. This is useful if e.g. half of the FS was
               converted earlier.

               The soft mode switch is (like every other filter) per-type.
               This means that we can convert for example meta chunks the
               "hard" way while converting data chunks selectively with soft
               switch.

       Profile names, used in profiles and convert are one of: raid0, raid1,
       raid10, raid5, raid6, dup, single.

EXIT STATUS
       btrfs balance 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), btrfs-device(8)

Btrfs v3.17                       11/22/2014                  BTRFS-BALANCE(8)

Czas wygenerowania: 0.00012 sek.

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