Just some notes on GPFS commands for reference. Will update as necessary.

List GPFS nodes

/usr/lpp/mmfs/bin/mmgetstate -a

Shutdown node resource

/usr/lpp/mmfs/bin/mmshutdown -N [node resource name]

List cluster status

/usr/lpp/mmfs/bin/mmshutdown/mmlscluster

Check all GPFS file systems

/usr/lpp/mmfs/bin/mmshutdown/mmlsfs all