| ASM and 11G R2 and Voting Disks [message #508125] |
Thu, 19 May 2011 09:05  |
hxman
Messages: 2
Registered: July 2010
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Junior Member |
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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.
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| Re: ASM and 11G R2 and Voting Disks [message #508486 is a reply to message #508125] |
Sun, 22 May 2011 01:50  |
John Watson
Messages: 8927
Registered: January 2010
Location: Global Village
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Senior Member |
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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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