jfs_fsck(8)             JFS utility - file system check            jfs_fsck(8)

       jfs_fsck - initiate replay of the JFS transaction log, and check and
       repair a JFS formatted device

       jfs_fsck [ -afnpvV ] [ -j journal_device ] [ --omit_journal_replay ] [
       --replay_journal_only ] device

       jfs_fsck is used to replay the JFS transaction log, check a JFS
       formatted device for errors, and fix any errors found.

       device is the special file name corresponding to the actual device to
       be checked (e.g. /dev/hdb1).

       jfs_fsck must be run as root.

       jfs_fsck should only be used to check an unmounted file system or a
       file system that is mounted READ ONLY.  Using jfs_fsck to check a file
       system mounted other than READ ONLY could seriously damage the file

       If no options are selected, the default is -p.

       -a     Autocheck mode - Replay the transaction log.  Do not continue
              fsck processing unless the aggregate state is dirty or the log
              replay failed.  Functionally equivalent to -p.  Autocheck mode
              is typically the default mode used when jfs_fsck is called at
              boot time.

       -f     Replay the transaction log and force checking even if the file
              system appears clean.  Repair all problems automatically.

       -j journal_device
              Specify the journal device.

       -n     Open the file system read only.  Do not replay the transaction
              log.  Report errors, but do not repair them.

              Omit the replay of the transaction log.  This option should not
              be used unless as a last resort (i.e.  the log has been severely
              corrupted and replaying it causes further problems).

       -p     Automatically repair ("preen") the file system.  Replay the
              transaction log.  Do not continue fsck processing unless the
              aggregate state is dirty or the log replay failed.  Functionally
              equivalent to -a.

              Only replay the transaction log.  Do not continue with a full
              file system check if the replay fails or if the file system is
              still dirty even after a journal replay.  In general, this
              option should only be used for debugging purposes as it could
              leave the file system in an unmountable state.  This option
              cannot be used with -f, -n, or --omit_journal_replay.

       -v     Verbose messaging - print details and debug statements to

       -V     Print version information and exit (regardless of any other
              chosen options).

       Check the 3rd partition on the 2nd hard disk, print extended
       information to stdout, replay the transaction log, force complete
       jfs_fsck checking, and give permission to repair all errors:

              jfs_fsck -v -f /dev/hdb3

       Check the 5th partition on the 1st hard disk, and report, but do not
       repair, any errors:

              jfs_fsck -n /dev/hda5

       The exit code returned by jfs_fsck represents one of the following

        0     No errors

        1     File system errors corrected and/or transaction log replayed

        2     File system errors corrected, system should be rebooted if file
              system was mounted

        4     File system errors left uncorrected

        8     Operational error

        16    Usage or syntax error

        128   Shared library error

       If you find a bug in JFS or jfs_fsck, please report it via the bug
       tracking system ("Report Bugs" section) of the JFS project web site:

       Please send as much pertinent information as possible, including the
       complete output of running jfs_fsck with the -v option on the JFS

       fsck(8), jfs_mkfs(8), jfs_fscklog(8), jfs_tune(8), jfs_logdump(8),

       Barry Arndt  (barndt@us.ibm.com)
       William Braswell, Jr.

       jfs_fsck is maintained by IBM.
       See the JFS project web site for more details:

                               October 29, 2002                    jfs_fsck(8)