перезаписать первичный суперблок резервной копией (overwrite primary superblock with a backup copy)
Имя (Name)
btrfs-select-super - overwrite primary superblock with a backup
copy
Синопсис (Synopsis)
btrfs-select-super -s number <device>
Описание (Description)
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.
Note
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
command.
Then run the check (in the non-repair mode) using the command
btrfs check -s where -s specifies the superblock copy to use.
Superblock copies exist in the following offsets on the device:
• primary: 64KiB (65536)
• 1st copy: 64MiB (67108864)
• 2nd copy: 256GiB (274877906944)
A superblock size is 4KiB (4096).
Параметры (Options)
-s|--super <superblock>
use 'superblock'th superblock copy, valid values are 0 1 or 2
if the respective superblock offset is within the device size
Смотри также (See also)
btrfs-inspect-internal(8), btrfsck check(8)
