命令

功能

mkfs.btrfs block_device

創(chuàng)建單個btrfs文件系統(tǒng)；例如

mkfs.btrfs  /dev/sdb1

mkfs.btrfs -L label block_device

創(chuàng)建卷標簽，可以使用label來掛載文件系統(tǒng)

mkfs.btrfs -L  myvolume /dev/sdb2

mkfs.btrfs -m single block_device

在一塊設備上創(chuàng)建一個btrfs文件系統(tǒng),但不復制元數(shù)據(jù)；例如

mkfs.btrfs -m  single /dev/sdc

mkfs.btrfs block_device1 block_device2 ...

元數(shù)據(jù)保存在多塊設備上；

mkfs.btrfs  /dev/sdd /dev/sde

mkfs.btrfs

-m raid0 block_device1 block_device2 ...

條帶化數(shù)據(jù)保存在多塊設備(raid0)

mkfs.btrfs -m raid0  /dev/sdd /dev/sde

mkfs.btrfs

-d raid1 block_device1 block_device2

鏡像數(shù)據(jù)在相關的設備(raid1)

mkfs.btrfs -d  raid1 /dev/sdd /dev/sde

mkfs.btrfs -d   raid10 -m

raid10 block_device1block_device2 block_device3 block_device4

創(chuàng)建raid10，至少四塊設備

mkfs.btrfs -d raid10 -m raid10 /dev/sdf  \

/dev/sdg /dev/sdh /dev/sdi /dev/sdj  /dev/sdk

# mkfs.btrfs -m single /dev/sdb      /*創(chuàng)建

Btrfs v3.16.2

See  http://btrfs.wiki.kernel.org for more information.

Turning ON  incompat feature 'extref': increased hardlink limit per file to 65536

fs created label  (null) on /dev/sdb

        nodesize 16384 leafsize 16384  sectorsize 4096 size 20.00GiB

# mount /dev/sdb  /my-btrfs-mountpoint    /*掛載，掛載目錄是先存在。

 # echo "UUID='b7175cc5-2b21-4c73-827f-791d00e77658  ' /my-btrfs-mountpoint btrfs defaults 0 0" >>/etc/fstab     //開機自動掛載

# btrfs  filesystem df /my-btrfs-mountpoint

Data, single: total=8.00MiB,  used=64.00KiB

System, single: total=4.00MiB,  used=16.00KiB

Metadata, single: total=264.00MiB, used=112.00KiB

GlobalReserve, single: total=16.00MiB,  used=0.00

# btrfs  filesystem show

Label: none  uuid: a0518a90-7c44-497b-8d57-1c40af672fab

         Total  devices 1 FS bytes used 192.00KiB

         devid    1 size 20.00GiB used 276.00MiB path  /dev/sdb

Btrfs v3.16.2

btrfs  device add devicemountpoint

擴容：添加一塊新的設備

btrfs  device add /dev/sdd/my-btrfs-mountpoint

btrfs  device delete device

刪除：刪除一塊現(xiàn)有設備(刪前要做好數(shù)據(jù)容量規(guī)劃)

btrfs  device delete /dev/sdd/my-btrfs-mountpoint

btrfs  filesystem balancemountpoint

在新添加設備或者移除設備后，刷新文件系統(tǒng)使數(shù)據(jù)重新分配到可用的設備上。

#btrfs  filesystem defragment /my-btrfs-mountpoint      /*整理文件系統(tǒng)

# btrfs filesystem   autodefrag  /my-btrfs-mountpoint     /*大型數(shù)據(jù)庫不建議使用

# btrfs filesystem resize +2g  /my-btrfs-mountpoint    /*添加2G空間

Resize '/my-btrfs-mountpoint' of '+2g'

# btrfs filesystem resize -2g  /my-btrfs-mountpoint    /*減少2G空間

Resize '/my-btrfs-mountpoint' of '-2g'

# btrfs filesystem resize 20g  /my-btrfs-mountpoint   /*設置空間大小為20G

Resize '/my-btrfs-mountpoint' of '20g'

#快照必須在其子文件系統(tǒng)目錄下

# btrfs subvolume snapshot /my-btrfs-mountpoint/  /my-btrfs-mountpoint/snapshot1   /*創(chuàng)建快照

Create a snapshot of  '/my-btrfs-mountpoint/' in '/my-btrfs-mountpoint/snapshot1'

# btrfs subvolume list  /my-btrfs-mountpoint   /*查看快照

ID 257 gen 12 top level 5 path snapshot1

# btrfs subvolume  delete /my-btrfs-mountpoint/snapshot1    /*刪除快照

Transaction  commit: none (default)

Delete  subvolume '/my-btrfs-mountpoint/snapshot1'

# btrfs replace start  /dev/sdc  /dev/sde  -r  /my-btrfs-mountpoint    /*/dev/sdc已經(jīng)有故障的設備，/dev/sde新設備 /my-btrfs-mountpoint文件系統(tǒng)掛載點

# btrfs replace status -1  /my-btrfs-mountpoint   /*查看更換后的狀態(tài)

Started on 29.Aug 14:49:22, finished on  29.Aug 14:49:22, 0 write errs, 0 uncorr. read errs