Section: OCFS2 Manual Pages (8)
Updated: January 2012
fsck.ocfs2 - Check an OCFS2
] [ -b superblock block
] [ -B block size
fsck.ocfs2 is used to check an OCFS2 file system.
device is the file where the file system is stored (e.g. /dev/sda1).
It will almost always be a device file but a regular file will work as well.
This option does the same thing as the -p option. It is provided for
backwards compatibility only: it is suggested that people use the -p
option whenever possible.
- -b superblock block
Normally, fsck.ocfs2 will read the superblock from the first block of
the device. This option specifies an alternate block that the superblock
should be read from. (Use -r instead of this option.)
- -B blocksize
The block size, specified in bytes, can range from 512 to 4096.
A value of 0, the default, is used to indicate that the blocksize should be automatically detected.
Optimize directories in filesystem. This option causes fsck.ocfs2 to
coalesce the directory entries in order to improve the filesystem
Force checking even if the file system is clean.
By default fsck.ocfs2 will check with the cluster services to ensure that
the volume is not in-use (mounted) on any node in the cluster before proceeding.
-F skips this check and should only be used when it can be guaranteed that
the volume is not mounted on any node in the cluster. WARNING: If the cluster
check is disabled and the volume is mounted on one or more nodes, file system
corruption is very likely. If unsure, do not use this option.
Usually fsck.ocfs2 will silently assume inodes whose generation number
does not match the generation number of the super block are unused inodes.
This option causes fsck.ocfs2 to ask the user if these inodes should in
fact be marked unused.
Give the 'no' answer to all questions that fsck will ask. This guarantees
that the file system will not be modified and the device will be opened
read-only. The output of fsck.ocfs2 with this option can be redirected
to produce a record of a file system's faults.
Automatically repair ("preen") the file system. This option will cause
fsck.ocfs2 to automatically fix any problem that can be safely
corrected without human intervention. If there are problems that require
intervention, the descriptions will be printed and fsck.ocfs2 will exit
with the value 4 logically or'd into the exit code. (See the
EXIT CODE section.) This option is normally used by the system's
- -r backup-number
mkfs.ocfs2 makes up to 6 backup copies of the superblock at offsets
1G, 4G, 16G, 64G, 256G and 1T depending on the size of the volume.
Use this option to specify the backup, 1 thru 6, to use to recover the
Show I/O statistics. If this option is specified twice, it shows the statistics
on a pass by pass basis.
Give the 'yes' answer to all questions that fsck will ask. This will repair
all faults that fsck.ocfs2 finds but will not give the operator a chance to intervene if fsck.ocfs2 decides that it wants to drastically repair the file system.
This option causes fsck.ocfs2 to produce a very large amount of debugging output.
Print version information and exit.
The exit code returned by fsck.ocfs2
is the sum of the following conditions:
0 - No errors
1 - File system errors corrected
2 - File system errors corrected, system should
4 - File system errors left uncorrected
8 - Operational error
16 - Usage or syntax error
32 - fsck.ocfs2 canceled by user request
128 - Shared library error
Oracle Corporation. This man page entry derives some text, especially the exit code summary, from
by Theodore Y. Ts'o <firstname.lastname@example.org
Copyright © 2004, 2012 Oracle. All rights reserved.