05-27-2018 11:57 PM - edited 05-28-2018 12:06 AM
Hi
What is Splitbrain mechanism on SFWHA( VCS on windows, using VxVM to manage shared storage) ?
As we know that :
1) IO-Fencing is not supported on Windows
2) SFWHA is support SCSI3 reservation PGR ( by tune on it in VEA-->Control panel--> system settings)
My question is
1) What is the Splitbrain mechanism on Windows SFWHA( by using VxVM manage shared disks) ?
2) Does SCSI3 reservation PGR is involved in the Splitbrain mechanism ?
Thanks
Solved! Go to Solution.
05-31-2018 04:08 AM
Found a good article explaining how it works in SFW/HA https://www.veritas.com/support/en_US/article.100022090
05-28-2018 12:00 AM
I mean : Infoscale enterprise on Windows ( SFWHA is lagacy name which in old versions)
05-28-2018 12:19 AM
Hi,
in the windows space we don't have many tools to fight it, you'll rely on heartbeats primarily.
05-28-2018 12:24 AM
Thanks for your reply.
Does SCSI3 reservation PGR is involved in the Splitbrain mechanism once all the heartbeat failed ?
05-28-2018 09:08 AM
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.
05-31-2018 04:08 AM
Found a good article explaining how it works in SFW/HA https://www.veritas.com/support/en_US/article.100022090