You have an unmounted btrfs file system:
# btrfs filesystem show
Label: ‘Btrfs’ uuid: 7bfe3239-47ee-442b-b9f8-49f88b6b1be4 Total devices 3 FS bytes used 300.51MB devid 2 size 4.88GB used 1.06GB path /dev/sdd devid 1 size 4.88GB used 580.00GB path /dev/sdc devid 3 size 4.88GB used 1.50GB path /dev/sdb You have these mounted devices:
# df -h
Filesystem Size Used
/dev/mapper/vg_exam1-LogVol_system Avail Use% Mounted on 9.6G 3.3G 3.9G 46% / tmpfs 499M 0 499M 0% /dev/shm
/dev/sda1 485M 77M 384M 17% /boot
You have a mount point for the btrfs file system:
# ls -all /btrfs total 0 drwxr-xr-x. 1 root root 0 Aug 12 10:17 . dr-xr-xr-x. 1 root root 276 Aug 12 10:36 ..
Which option represents the correct order to add a new device /dev/sdb to the btrfs file system and rebalance data blocks between all devices?
1- btrfs device add /dev/sdb /btrfs
2- btrfs device balance /dev/sdb
3- btrfs filesystem balance /btrfs
4- Manual rebalance is not needed. Btrfs will rebalance it automatically.
5- btrfs device add /dev/sdd /dev/sdb
6- mount LABEL=Btrfs /btrfs
A. 6, 1, 3
B. 5, 2
C. 5, 4
D. 6, 5, 3
E. 6, 1, 4
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