RE: multipathing, AMSLIB and HBA
- From: "Fahrenfort, Keith (PSS Americas Oracle)" <keith.fahrenfort@xxxxxx>
- To: <sosoracle@xxxxxxxxx>
- Date: Wed, 21 Jun 2006 08:38:34 -0500
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@xxxxxxxxx>
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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