Taken from Deleting Nodes from a GPFS Cluster (IBM)
Step 1: Shutdown the Nodes before deleting
On the NSD Node
# mmshutdown -N node01
mmshutdown -N node01
Wed Nov 1 05:13:43 SGT 2010: mmshutdown: Starting force unmount of GPFS file systems
Wed Nov 1 05:13:48 SGT 2010: mmshutdown: Shutting down GPFS daemons
node01: Shutting down!
node01: 'shutdown' command about to kill process 10682
node01: Unloading modules from /lib/modules/2.6.18-194.el6.x86_64/extra
node01: Unloading module mmfs26
node01: Unloading module mmfslinux
node01: Unloading module tracedev
Wed Jun 1 05:14:02 SGT 2010: mmshutdown: Finished
Step 2: Deleting a Node
# mmdelnode -N node01
Verifying GPFS is stopped on all affected nodes ...
mmdelnode: Command successfully completed
mmdelnode: Propagating the cluster configuration data to all
affected nodes. This is an asynchronous process.
Step 3: Confirm that the nodes has been deleted.
# mmlscluster
Step 4: If you are deleting the client permanently, check and update the license file
# mmlslicense
Summary information
Number of nodes defined in the cluster: 20
Number of nodes with server license designation: 3
Number of nodes with client license designation: 17
Number of nodes still requiring server license designation: 0
Number of nodes still requiring client license designation: 0
