3.7.0 HP StorageWorks HP Scalable NAS File Serving Software installation guide HP Scalable NAS for Linux (AG513-96004, October 2009)

Then unload the cluster service and HBA drivers:
/etc/init.d/pmxs unload
If the multipath devices are not removed before running the pmxs unload command,
the HBA drivers will not be unloaded because the multipath devices are associated
with storage on those adapters.
HP Scalable NAS File Serving Software installation guide 71