cancel
Showing results for 
Search instead for 
Did you mean: 

What is Splitbrain mechanism on SFWHA

Tonado_wang
Level 3

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

1 ACCEPTED SOLUTION

Accepted Solutions

Mouse
Moderator
Moderator
Partner    VIP    Accredited Certified

Found a good article explaining how it works in SFW/HA https://www.veritas.com/support/en_US/article.100022090

View solution in original post

5 REPLIES 5

Tonado_wang
Level 3

I mean : Infoscale enterprise on Windows ( SFWHA is lagacy name which in old versions)

RiaanBadenhorst
Moderator
Moderator
Partner    VIP    Accredited Certified

Hi,

in the windows space we don't have many tools to fight it, you'll rely on heartbeats primarily.

https://www.veritas.com/support/en_US/article.100019784

Thanks for your reply. 

Does SCSI3 reservation PGR is involved in the Splitbrain mechanism once all the heartbeat failed ?

Mouse
Moderator
Moderator
Partner    VIP    Accredited Certified

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.

Mouse
Moderator
Moderator
Partner    VIP    Accredited Certified

Found a good article explaining how it works in SFW/HA https://www.veritas.com/support/en_US/article.100022090