Red Hat GFS 6.1 -, Administrator'S Manual

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Chapter 5. Managing GFS 43
5.5. Growing a File System
The
gfs_grow
command is used to expand a GFS file system after the device where the
file system resides has been expanded. Running a
gfs_grow
command on an existing GFS
file system fills all spare space between the current end of the file system and the end of
the device with a newly initialized GFS file-system extension. When the fill operation is
completed, the resource index for the file system is updated. All nodes in the cluster can
then use the extra storage space that has been added.
The
gfs_grow
command must be run on a mounted file system, but only needs to be run
on one node in a cluster. All the other nodes sense that the expansion has occurred and
automatically start using the new space.
To verify that the changes were successful, use the
gfs_grow
command with the
-T
(test)
and
-v
(verbose) flags. Running the command with those flags displays the current state of
the mounted GFS file system.
5.5.1. Usage
gfs_grow
MountPoint
MountPoint
Specifies the GFS file system to which the actions apply.
5.5.2. Comments
Before running the
gfs_grow
command:
•
Back up important data on the file system.
•
Display the volume that is used by the file system to be expanded by running a
gfs_tool df
MountPoint
command.
•
Expand the underlying cluster volume with LVM. (Refer to the LVM HOWTO at
http://www.tldp.org/HOWTO/LVM-HOWTO/index.html for command usage with
CLVM.)
After running the
gfs_grow
command, run a
df
command to check that the new space is
now available in the file system.
5.5.3. Examples
In this example, the file system on the
/gfs1
directory is expanded.
gfs_grow /gfs1