GPFS: Administration and Programming Reference - IRA Home

mmadddisk Command
Note: Rebalancing of files is an I/O intensive and time consuming operation, and is important only
for file systems with large files that are mostly invariant. In many cases, normal file update
and creation will rebalance your file system over time, without the cost of the rebalancing.
-v {yes | no}
Verify that specified disks do not belong to an existing file system. The default is -v yes. Specify -v
no only when you want to reuse disks that are no longer needed for an existing file system. If the
command is interrupted for any reason, you must use the -v no option on the next invocation of
the command.
Exit status
0 Successful completion.
nonzero A failure has occurred.
Security
You must have root authority to run the mmadddisk command.
You may issue the mmadddisk command from any node in the GPFS cluster.
When using the rcp and rsh commands for remote communication, a properly configured .rhosts file must
exist in the root user’s home directory on each node in the GPFS cluster. If you have designated the use
of a different remote communication program on the mmcrcluster or the mmchcluster command, you
must ensure:
1. Proper authorization is granted to all nodes in the GPFS cluster.
2. The nodes in the GPFS cluster can communicate without the use of a password, and without any
extraneous messages.
Examples
To add the disks whose descriptors are located in ./disk_pools to the file system fs1 and rebalance the
existing files after it is added, issue this command:
mmadddisk fs1 -F ./disk_pools -r
The system displays information similar to:
GPFS: 6027-531 The following disks of fs1 will be formatted on node
k148n07.kgn.ibm.com:
gpfs10nsd: size 2202180 KB
Extending Allocation Map
Creating Allocation Map for storage pool ’pool2’
75 % complete on Thu Feb 16 13:57:52 2006
100 % complete on Thu Feb 16 13:57:54 2006
Flushing Allocation Map for storage pool ’pool2’
GPFS: 6027-535 Disks up to size 24 GB can be added to storage
pool pool2.
Checking allocation map for storage pool system
62 % complete on Thu Feb 16 13:58:03 2006
100 % complete on Thu Feb 16 13:58:06 2006
Checking allocation map for storage pool pool1
62 % complete on Thu Feb 16 13:58:11 2006
100 % complete on Thu Feb 16 13:58:14 2006
Checking allocation map for storage pool pool2
63 % complete on Thu Feb 16 13:58:19 2006
100 % complete on Thu Feb 16 13:58:22 2006
GPFS: 6027-1503 Completed adding disks to file system fs1.
mmadddisk: 6027-1371 Propagating the cluster configuration
data to all affected nodes. This is an asynchronous process.
64 GPFS: Administration and Programming Reference