For any cluster larger than 1 node, I/O fencing is highly recommended to protect data integrity in the event of a split brain. 2 nodes is not in any way more resistant to split brain than 3 nodes or more.
VCS does not use any form of quorum based membership (quorum has a number of it's own ugly issues), so there is no difference in how our membership works when you have 2, 3, or 32 nodes -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Shashi Kanth Boddula Sent: Thursday, June 12, 2008 7:30 AM To: Mayank Vasa Cc: veritas-ha@mailman.eng.auburn.edu Subject: Re: [Veritas-ha] vxfencing >2 nodes Ok, thanks for clarification. I have seen many clustering products documentation which says that fencing/quorum is optional/not_required for more than 2 node clusters, and they says that there is very very less chance of happening split brain condition for more than 2 node clusters. -- Shashi Mayank Vasa wrote: > Shashi: > > The number of nodes is not a decision making factor for fencing. For a > cluster greater than 2 nodes, fencing helps to protect your data in > the case of a split brain scenario. > > SFRAC requires fencing. It is not supported without it. > > Regards, > + Mayank > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Shashi > Kanth Boddula > Sent: Wednesday, June 11, 2008 12:23 AM > To: veritas-ha@mailman.eng.auburn.edu > Subject: [Veritas-ha] vxfencing >2 nodes > > Is vxfencing required if we go for >=3 node cluster ? Or, vxfencing > is optional if we go for >=3 node cluster ? > > > I am going for 4-node VCS5 SFRAC, still vxfencing required for me ? , > does all VCS5 SFRAC modules work properly without vxfencing ? > > > > _______________________________________________ > Veritas-ha maillist - Veritas-ha@mailman.eng.auburn.edu > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-ha > > _______________________________________________ Veritas-ha maillist - Veritas-ha@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-ha _______________________________________________ Veritas-ha maillist - Veritas-ha@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-ha
