143 lines
4.1 KiB
Plaintext
143 lines
4.1 KiB
Plaintext
btrfs-device(8)
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===============
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NAME
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----
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btrfs-device - control btrfs devices
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SYNOPSIS
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--------
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*btrfs device* <subcommand> <args>
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DESCRIPTION
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-----------
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*btrfs device* is used to control the btrfs devices, since btrfs can be used
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across several devices, *btrfs device* is used for multiple device management.
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DEVICE MANAGEMENT
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-----------------
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Btrfs filesystem is capable to manage multiple devices.
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Btrfs filesystem uses different profiles to manage different RAID level, and
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use balance to rebuild chunks, also devices can be added/removed/replace
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online.
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Profile::
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Btrfs filesystem uses data/metadata profiles to manage allocation/duplication
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mechanism. +
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Profiles like RAID level can be assigned to data and metadata separately.
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+
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See `mkfs.btrfs`(8) for more details.
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RAID level::
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Btrfs filesystem supports most of the standard RAID level: 0/1/5/6/10. +
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RAID levels can be assigned at mkfs time or online.
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+
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See `mkfs.btrfs`(8) for mkfs time RAID level assign and `btrfs-balance`(8) for
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online RAID level assign.
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+
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NOTE: Since btrfs is under heavy development especially the RAID5/6 support,
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it is *highly* recommended to read the follow btrfs wiki page to get more
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updated details on RAID5/6: +
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https://btrfs.wiki.kernel.org/index.php/RAID56
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Balance::
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`btrfs-balance`(8) subcommand can be used to balance or rebuild chunks to the
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desired profile.
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+
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Due to the fact that balance can rebuild/recovery chunks according to its RAID
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duplication if possible, so when using RAID1/5/6/10 with some devices failed
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and you just added a new device to btrfs using `btrfs-device`(8), you should
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run `btrfs-balance`(8) to rebuild the chunks.
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+
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See `btrfs-balance`(8) for more details.
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Device add/remove/replace::
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Device can be added/removed using `btrfs-device`(8) subcommand and replaced
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using `btrfs-replace`(8).
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+
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When device is removed or replaced, btrfs will do the chunk rebuild if needed.
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+
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See `btrfs-replace`(8) man page for more details on device replace.
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SUBCOMMAND
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----------
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*add* [-Kf] <dev> [<dev>...] <path>::
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Add device(s) to the filesystem identified by <path>.
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+
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If applicable, a whole device discard (TRIM) operation is performed.
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+
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`Options`
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+
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-K|--nodiscard::::
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do not perform discard by default
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-f|--force::::
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force overwrite of existing filesystem on the given disk(s)
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*delete* <dev> [<dev>...] <path>::
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Remove device(s) from a filesystem identified by <path>.
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*ready* <device>::
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Check device to see if it has all of it's devices in cache for mounting.
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*scan* [(--all-devices|-d)|<device> [<device>...]]::
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Scan devices for a btrfs filesystem.
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If one or more devices are passed, these are scanned for a btrfs filesystem.
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If no devices are passed, btrfs uses block devices containing btrfs
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filesystem as listed by blkid.
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Finally, if '--all-devices' or '-d' is passed, all the devices under /dev are
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scanned.
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*stats* [-z] <path>|<device>::
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Read and print the device IO stats for all mounted devices of the filesystem
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identified by <path> or for a single <device>.
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+
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`Options`
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+
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-z::::
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Reset stats to zero after reading them.
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*usage* [options] <path> [<path>...]::
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Show detailed information about internal allocations in devices.
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+
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`Options`
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-b|--raw::::
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raw numbers in bytes, without the 'B' suffix
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-h|--human-readable::::
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print human friendly numbers, base 1024, this is the default
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-H::::
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print human friendly numbers, base 1000
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--iec::::
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select the 1024 base for the following options, according to the IEC standard
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--si::::
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select the 1000 base for the following options, according to the SI standard
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-k|--kbytes::::
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show sizes in KiB, or kB with --si
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-m|--mbytes::::
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show sizes in MiB, or MB with --si
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-g|--gbytes::::
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show sizes in GiB, or GB with --si
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-t|--tbytes::::
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show sizes in TiB, or TB with --si
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If conflicting options are passed, the last one takes precedence.
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EXIT STATUS
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-----------
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*btrfs device* returns a zero exit status if it succeeds. Non zero is
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returned in case of failure.
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AVAILABILITY
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------------
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*btrfs* is part of btrfs-progs.
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Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for
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further details.
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SEE ALSO
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--------
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`mkfs.btrfs`(8),
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`btrfs-replace`(8),
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`btrfs-balance`(8)
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