xfs file system repair:
damage:
[root@localhost ~]# mkdir /d
[root@localhost ~]# mount /dev/sdb1 /d
[root@localhost ~]# touch /d/{a..f}
[root@localhost ~]# ls /d
a b c d e f lost+found
[root@localhost ~]# umount /dev/sdb1
[root@localhost ~]# dd if=/dev/zero of=/dev/sdb1 bs=512 count=4
Records read 4 + 0
Write a record of 4 + 0
2048 bytes (2.0 kB) has been copied, 0.000218494 seconds, 9.4 MB / sec
[root@localhost ~]# mount /dev/sdb1 /d
mount: / dev / sdb1 write protection, will be mounted read-only
mount: unknown filesystem type "(null)"
repair:
[root@localhost ~]# xfs_repair /dev/sdb1
[root@localhost ~]# mount /dev/sdb1 /d
[root@localhost ~]#
ext4 file system repair:
damage:
[root@localhost ~]# mkdir /d
[root@localhost ~]# mount /dev/sdb1 /d
[root@localhost ~]# touch /d/{a..f}
[root@localhost ~]# ls /d
a b c d e f lost+found
[root@localhost ~]# umount /dev/sdb1
[root@localhost ~]# dd if=/dev/zero of=/dev/sdb1 bs=512 count=4
Records read 4 + 0
Write a record of 4 + 0
2048 bytes (2.0 kB) has been copied, 0.000218494 seconds, 9.4 MB / sec
[root@localhost ~]# mount /dev/sdb1 /d
mount: / dev / sdb1 write protection, will be mounted read-only
mount: unknown filesystem type "(null)"
repair: