Re: 10gR2 RAC: Mirroring OCR and voting disks

"DA Morgan" <damorgan_at_psoug.org> wrote in message news:1150304122.71218_at_bubbleator.drizzle.com...
> Andreas Sheriff wrote:
>>
>> Where does it state in the manual that the majority must survive?
>> I love how they leave these little tidbits out. 'Makes it exciting!
>
> I don't know that it states it explicitly: Perhaps it does. But that
> was my assumption based on the fact that an uneven number of resources
> was required. With control files any one can survive and thus two
> control files or three it makes no difference. If an uneven number is
> required then it is consistent that a vote takes place and that a tie
> is not allowed.
> --
> Daniel A. Morgan
> University of Washington
> damorgan_at_x.washington.edu
> (replace x with u to respond)
> Puget Sound Oracle Users Group
> www.psoug.org

Just a hypothesis here...

Could it be that if a majority of the votedisks survive then nodes seeing a majority share in common at least one of the votedisks. Nodes that see 1/2 the vote disks have a 50/50 chance of getting it right that the other nodes share at least one of the votedisks. Finally, nodes that see less than 1/2 have an even lower chance of all seeing a shared votedisk.

Hence, a majority of the votedisks have to survive for a proper quorum to exist.

Couldn't they just have said this?

-- 
Andreas
Oracle 9i Certified Professional
Oracle 10g Certified Professional
Oracle 9i Certified PL/SQL Developer


"If you don't eat your meat, you cannot have any pudding.
"How can you have any pudding if you don't eat your meat?!?!"
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