Fujitsu PRIMEQUEST 500A Series Installation Manual page 331

(2) Check file system matching
To check whether the file system to be backed up is normal, check its match.
The file system that needs to be checked is ext3 (or ext2). "/boot/efi" and swap need
not be checked.
For location other than "/" (root), "/boot/efi," and swap
1
Demount the file system to be backed up.
# cd /
# umount /work
2
Check the matching of the demounted file system.
# e2fsck -pfv /dev/sda4
Note:
For "/" (root)
1 Remount the "/" file system in Read-Only mode.
# mount -r -n -o remount /
2
Check the matching of the file system.
# e2fsck -pfv /dev/sda2
3
Remount the file in normal state.
# mount -w -n -o remount /
Note:
C122-E001-10EN
Do not execute the e2fsck command if the umount command
produces an error.
If the e2fsck command is executed with the file system mounted,
the selected volume may be damaged.
Do not execute the e2fsck command if the mounting in Read-Only
mode fails.
If the e2fsck command is executed with the file system mounted as
write-enabled, the selected volume may be damaged.
4.12 OS Backup Settings
4-145