Found a good article explaining how it works in SFW/HA https://www.veritas.com/support/en_US/article.100022090
My understanding of SCSI-3 PGR is that imported disk groups would have a reservation placed, this is what is common between SFW and SF/HA on Unix.
Fencing is on top of SCSI-3 PGR. Again, to my understanding, reservations placed on disks would not allow a node which does not have keys to access disks automatically so a protection from data corruption is still there even without fencing, this should be the case in SFW/HA. But this feature alone is not enough for membership arbitration which is what effectively fencing does in Unix.
Found a good article explaining how it works in SFW/HA https://www.veritas.com/support/en_US/article.100022090
