.TH fsck.gfs2 8

.SH NAME

fsck.gfs2 - offline GFS and GFS2 file system checker

.SH SYNOPSIS

.B fsck.gfs2

[\fIoptions\fR] \fIdevice\fR

.SH WARNING

All computers \fImust\fP have the filesystem unmounted before running

fsck.gfs2.  Failure to unmount from all nodes in a cluster will likely result

in filesystem corruption.

.SH DESCRIPTION

fsck.gfs2 will check that the GFS or GFS2 file system on a device is

structurally valid.  It should not be run on a mounted file system.  If file

system corruption is detected, it will attempt to repair the file system.

There is a limit to what fsck.gfs2 can do.  If important file system structures

are destroyed, such that the checker cannot determine what the repairs should

be, reparations could fail.

Other file system checkers will not check the file system if it is "clean"

(i.e. unmounted since the last use).  With gfs2, storage may be shared among

several nodes in a cluster, and therefore problems may have been introduced on

a different computer.  Therefore, fsck.gfs2 will always check the file system

unless the -p (preen) option is used, in which case it follows special rules

(see below).

fsck.gfs2 will log a message to the system log on start and exit to aid

debugging and administration.

.SH OPTIONS

.TP

\fB-a\fP

Same as the \fB-p\fP (preen) option.

.TP

\fB-f\fP

Force checking even if the file system seems clean.

.TP

\fB-h\fP

Help.

This prints out the proper command line usage syntax.

.TP

\fB-q\fP

Quiet.

.TP

\fB-n\fP

No to all questions. By specifying this option, fsck.gfs2 will only show the changes that

would be made, but not make any changes to the filesystem.

This option may not be used with the \fB-y\fP or \fB-p\fP/\fB-a\fP options.

.TP

\fB-p\fP

Automatically repair ("preen") the file system if it is dirty and safe to do so,

otherwise exit.

If the file system has locking protocol \fIlock_nolock\fR, it is considered a

non-shared storage device and it is considered safe.  If the locking protocol

is lock_dlm and \fB-a\fP or \fB-p\fP was specified, the check is considered unsafe as it

cannot be determined whether the device is mounted by other nodes in the cluster.

In this case a warning is given if any damage or dirty journals are found. The

file system should then be unmounted from all nodes in the cluster and

fsck.gfs2 should be run manually without the \fB-a\fP or \fB-p\fP options.

This option may not be used with the \fB-n\fP or \fB-y\fP options.

.TP

\fB-V\fP

Print out the program version information.

.TP

\fB-v\fP

Verbose operation.

Print more information while running.

.TP

\fB-y\fP

Yes to all questions. By specifying this option, fsck.gfs2 will not prompt before making

changes.

This option may not be used with the \fB-n\fP or \fB-p\fP/\fB-a\fP options.

.SH SEE ALSO

.BR gfs2 (5),

.BR gfs2_jadd (8),

.BR gfs2_grow (8)