5.8. Growing a Pool Volume
An existing pool can be expanded while it is activated or deactivated. You can grow a pool by creating a new pool configuration file (based on an existing pool configuration file), then adding one or more subpools containing the new devices to be added to the volume.
Refer to Section 5.7 Displaying Pool Configuration Information for information on creating a configuration file for an existing pool volume.
5.8.1. Usage
pool_tool -g [ConfigFile] |
- ConfigFile
Specifies the file describing the extended pool.
 | Note |
|---|---|
The pool_tool -g command supersedes the pool_grow command as of GFS 5.2. Although the pool_grow command is still available, it is not supported in GFS 5.2 and later. |
5.8.2. Example procedure
The following example procedure expands a pool volume.
Create a new configuration file from configuration information for the pool volume that you want to expand (in this example, pool0):
# pool_tool -p /dev/pool/pool0 > pool0-new.cfg # cat pool0-new.cfg poolname pool0 subpools 1 subpool 0 128 4 gfs_data pooldevice 0 0 /dev/sdb1 pooldevice 0 1 /dev/sdc1 pooldevice 0 2 /dev/sdd1 pooldevice 0 3 /dev/sde1
Edit the new file, pool0-new.cfg, by adding one or more subpools that contain the devices or partitions, as indicated in this example:
poolname pool0 subpools 2 <--- Change subpool 0 128 4 gfs_data subpool 1 0 1 gfs_data <--- Add pooldevice 0 0 /dev/sdb1 pooldevice 0 1 /dev/sdc1 pooldevice 0 2 /dev/sdd1 pooldevice 0 3 /dev/sde1 pooldevice 1 0 /dev/sdf1 <--- Add
After saving the file, verify that the file has been changed:
# cat pool0-new.cfg poolname pool0 subpools 2 <--- Changed subpool 0 128 4 gfs_data subpool 1 0 1 gfs_data <--- Added pooldevice 0 0 /dev/sdb1 pooldevice 0 1 /dev/sdc1 pooldevice 0 2 /dev/sdd1 pooldevice 0 3 /dev/sde1 pooldevice 1 0 /dev/sdf1 <--- Added
Run the pool_tool command with the grow (-g) option specifying the configuration file:
pool_tool -g pool0-new.cfg