RE: multipathing, AMSLIB and HBA

Hi Cindy, ASM and ASMLib currently have no multipathing capability.

So to remove the Single Point of Failure storage connectivity per server, you need to provide at least two paths to that storage, and storage multipathing software that can manage those paths. Storage multipathing software is either a free or for-fee product - you are limited to what the storage vendor supports/certifies with RAC.

I recommend at least two single-port HBA's per server, although some people seem ok recommending one dual-port HBA per server. Both options allow two paths to the storage, although if you lose a single dual-port HBA, you lose both storage paths it provides.

Hope this helps! Keith

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-----Original Message-----

From: "oracle sos" <sosoracle_at_gmail.com>

Subject: multipathing, AMSLIB and HBA

Hi,

I am kind of confusing with the usage, functionalities and terminologies of
multipathing, ASMLIB and HBA in RAC env.

I saw a note in Matalink of "Note, that Oracle Corporation does not certify
ASM against these multipathing utilities." Why do people still choose multipathing (like EMC PowerPath, or IBM SDD) in RAC? What are the benefits
that ASMLIB can't provide? Does ASMLIB provide same functions as multipathing? How many minimums HBA per server in EAC env are suitable?

Thanks for the advice.

Cindy
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http://www.freelists.org/webpage/oracle-l Received on Wed Jun 21 2006 - 08:38:34 CDT