btrfs-select-super - overwrite primary superblock with a backup copy
-s number <device>
Destructively overwrite all copies of the superblock with a specified copy. This
helps in certain cases, for example when write barriers were disabled during a
power failure and not all superblocks were written, or if the primary
superblock is damaged, eg. accidentally overwritten.
The filesystem specified by device
must not be mounted.
Prior to overwriting the primary superblock, please make sure that the backup
copies are valid!
To dump a superblock use the btrfs inspect-internal dump-super
or the obsolete command btrfs-show-super
Then run the check (in the non-repair mode) using the command btrfs check
specifies the superblock copy to use.
Superblock copies exist in the following offsets on the device:
•primary: 64KiB (65536)
•1st copy: 64MiB
•2nd copy: 256GiB
A superblock size is 4KiB
use 'superblock’th superblock copy,
valid values are 0 1 or 2 if the respective superblock offset is within the
(8), btrfsck check