sracharla
3 Silver

Disable SP Write Cache for VNX LUNs in a Oracle ASM Configuration ?


Hello,

Is it a best practice recommendation to disable SP Write Cache on VNX RAID Group LUNs in a Oracle ASM configuration.

Thanks

8 Replies
dynamox
7 Thorium

Re: Disable SP Write Cache for VNX LUNs in a Oracle ASM Configuration ?

never heard of such a recommendation, where did you see that ?

0 Kudos

Re: Disable SP Write Cache for VNX LUNs in a Oracle ASM Configuration ?

Leave the best practices, if you do that, it will never work.

Are you trying to disable it on a particular LUN, till the time you are configuring Oracle ASM or is it permanently ?

Thanx

Rakesh

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Roger_Wu
5 Rhenium

Re: Disable SP Write Cache for VNX LUNs in a Oracle ASM Configuration ?

Disable Write Cache or Fast Cache? Is it a read-only application?

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sracharla
3 Silver

Re: Disable SP Write Cache for VNX LUNs in a Oracle ASM Configuration ?

This was recommended by Oracle architect here claiming it as a EMC recommendation.

I was not affirmative though, never did or saw such a recommendation  Just wanted to make sure.

I know that FAST cache is recommeneded to be disabled for Oracle archive and redo logs, do not see any use in disabling SP write cache

Thanks for the responses.

0 Kudos

Re: Disable SP Write Cache for VNX LUNs in a Oracle ASM Configuration ?

Your Subject line is a bit different. Now you may be correct. They may want to automate it by Oracle ASM.

Thanx

Rakesh

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Re: Disable SP Write Cache for VNX LUNs in a Oracle ASM Configuration ?

Can you please tell me which Version (Oracle and VNX) and which white papers (if any) are they referring to ?

Thnx

Rakesh

0 Kudos
sracharla
3 Silver

Re: Disable SP Write Cache for VNX LUNs in a Oracle ASM Configuration ?

Oracle11gR2 RAC

VNX7500

They did not refer to any white papers yet.

They got the SP write cache disabled but FAST cache enabled for all their database LUNs and FRA LUNs.

Thanks


0 Kudos

Re: Disable SP Write Cache for VNX LUNs in a Oracle ASM Configuration ?

Wow!!! interesting to get to know something new....not so sure....

dynamox and Rainer,

Could you please shed a little bit light on it...

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