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Diffstat (limited to 'Documentation/btrfs-device.txt')
| -rw-r--r-- | Documentation/btrfs-device.txt | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/Documentation/btrfs-device.txt b/Documentation/btrfs-device.txt index 20d7bcd7..523ae4de 100644 --- a/Documentation/btrfs-device.txt +++ b/Documentation/btrfs-device.txt @@ -14,6 +14,46 @@ DESCRIPTION 'btrfs device' is used to control the btrfs devices, since btrfs can be used across several devices, 'btrfs device' is used for multiple device management. +DEVICE MANAGEMENT +----------------- +Btrfs filesystem is capable to manage multiple devices. + +Btrfs filesystem uses different profiles to manage different RAID level, and +use balance to rebuild chunks, also devices can be added/removed/replace +online. + +Profile:: +Btrfs filesystem uses data/metadata profiles to manage allocation/duplication +mechanism. Profiles like RAID level can be assigned to data and metadata separately. ++ +See `mkfs.btrfs`(8) for more details. + +RAID level:: +Btrfs filesystem supports most of the standard RAID level: 0/1/5/6/10. +RAID levels can be assigned at mkfs time or online. ++ +See `mkfs.btrfs`(8) for mkfs time RAID level assign and `btrfs-balance`(8) for +online RAID level assign. + +Balance:: +`btrfs-balance`(8) subcommand can be used to balance or rebuild chunks to the +desired profile. ++ +Due to the fact that balance can rebuild/recovery chunks according to its RAID +duplication if possible, so when using RAID1/5/6/10 with some devices failed +and you just added a new device to btrfs using `btrfs-device`(8), you should +run `btrfs-balance`(8) to rebuild the chunks. ++ +See `btrfs-balance`(8) for more details. + +Device add/remove/replace:: +Device can be added/removed using `btrfs-replace`(8) subcommand and replaced +using `btrfs-replace`(8). ++ +When device is removed or replaced, btrfs will do the chunk rebuild if needed. ++ +See `btrfs-replace`(8) and this man page for more details. + SUBCOMMAND ---------- 'add' [-Kf] <dev> [<dev>...] <path>:: @@ -73,3 +113,5 @@ further details. SEE ALSO -------- `mkfs.btrfs`(8), +`btrfs-replace`(8), +`btrfs-balance`(8) |