.TH gfs2_grow 8

.SH NAME

gfs2_grow - Expand a GFS2 filesystem

.SH SYNOPSIS

.B gfs2_grow

[\fIOPTION\fR]... <\fIDEVICE\fR|\fIMOUNTPOINT\fR>...

.SH DESCRIPTION

gfs2_grow is used to expand a GFS2 filesystem after the device

upon which the filesystem resides has also been expanded.  By

running gfs2_grow on a GFS2 filesystem, you are requesting that

any spare space between the current end of the filesystem and

the end of the device is filled with a newly initialized GFS2

filesystem extension.  When this operation is complete, the resource

group index for the filesystem is updated so that all nodes in the

cluster can use the extra storage space that has been added.

You may only run gfs2_grow on a mounted filesystem; expansion of 

unmounted filesystems is not supported.  You only need to

run gfs2_grow on one node in the cluster.  All the other nodes will

see the expansion has occurred and automatically start to use the

newly available space.

You must be superuser to execute \fBgfs2_grow\fP.  The gfs2_grow

tool tries to prevent you from corrupting your filesystem by checking as

many of the likely problems as it can.  When expanding a filesystem,

only the last step of updating the resource index affects the currently

mounted filesystem and so failure part way through the expansion process

should leave your filesystem in its original unexpanded state.

You can run gfs2_grow with the \fB-T\fP flag to get a display

of the current state of a mounted GFS2 filesystem.

The gfs2_grow tool uses the resource group (RG) size that was originally

calculated when mkfs.gfs2 was done.  This allows tools like fsck.gfs2

to better ensure the integrity of the file system.  Since the new free

space often does not lie on even boundaries based on that RG size,

there may be some unused space on the device after gfs2_grow is run.

.SH OPTIONS

.TP

\fB-D\fP

Print out debugging information about the filesystem layout.

.TP

\fB-h\fP

Prints out a short usage message and exits.

.TP

\fB-q\fP

Be quiet.  Don't print anything.

.TP

\fB-T\fP

Test. Do all calculations, but do not write any data to the disk and do

not expand the filesystem. This is used to discover what the tool would

have done were it run without this flag.

.TP

\fB-V\fP

Version. Print out version information, then exit.

.SH BUGS

There is no way to shrink a GFS2 filesystem.

.SH SEE ALSO

mkfs.gfs2(8) gfs2_jadd(8)