gfs2_grow - Expand a GFS2 filesystem
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 gfs2_grow
. 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 -T
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.
- Print out debugging information about the filesystem
- Prints out a short usage message and exits.
- Be quiet. Don't print anything.
- 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.
- Version. Print out version information, then exit.
There is no way to shrink a GFS2 filesystem.