How to Delete Nodes from a GPFS Cluster

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