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ASM and 11G R2 and Voting Disks [message #508125] Thu, 19 May 2011 09:05 Go to next message
hxman
Messages: 2
Registered: July 2010
Junior Member
Our back-end storage for this RAC implementation is a Sun Storage 7310 NAS appliance running in clustered mode, with storage distributed across 2 controllers running in active/active mode.

Questions....

1) How many voting disks are recommended in a RAC configuration? 3?

I believe that when we do a NAS controller failover there might be a brief period of time that RAC can't see the Voting Disks. This might be causing some problems we have been experiencing during NAS failover testing and a recent problem we have had.

2) My question, should we not have these Voting Disks split between the 2 NAS controllers so when a failure occurs and the NAS heads need to failover resources, RAC will ALWAYS see the Voting Disks? Currently, there will be a brief period of time RAC will not see the Voting Disks.
Re: ASM and 11G R2 and Voting Disks [message #508141 is a reply to message #508125] Thu, 19 May 2011 10:11 Go to previous messageGo to next message
Mahesh Rajendran
Messages: 10694
Registered: March 2002
Location: oracleDocoVille
Senior Member
Account Moderator
http://download.oracle.com/docs/cd/E11882_01/rac.112/e16794/votocr.htm#CHDFJHHJ

Re: ASM and 11G R2 and Voting Disks [message #508486 is a reply to message #508125] Sun, 22 May 2011 01:50 Go to previous message
John Watson
Messages: 8560
Registered: January 2010
Location: Global Village
Senior Member
Quote:
How many voting disks are recommended in a RAC configuration? 3?
This is for you and your users to decide. There is no right or wrong: only whether you are comfirming to your site procedures. My personal preference (and it is no more than that) is to define a little high redundany disk group just for the voting disks and OCR.

Quote:
This might be causing some problems we have been experiencing during NAS failover testing and a recent problem we have had.
What were the problems?

Quote:
should we not have these Voting Disks split between the 2 NAS controllers
How will you split them? You may need a vote disk on a third, independent, device, to ensure that the nodes can always read a quorum of disks.
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