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Re: 9iR2 RAC on HP

From: hpuxrac <>
Date: 2 Sep 2005 05:52:07 -0700
Message-ID: <>

> Hi
> We are planning to set up a 2-node 9iR2 RAC on machines running HPUX11i
> v1. We now have to choose between RAW and file system.

This environment works well. We are just starting to think about 10g Release 2 -- if I were you I would also think about that.

> Q1. Is it true that if we would like to get a file system for storage
> of oracle files, we would need to purchase a third party CFS ... eg.
> from Veritas? Normal HP file system will not work?

Yes this is true. If you want to use files instead of RAW you need a clustered file system.

> Q2. If we decide to use RAW, do we need to purchase MC/Service Guard in
> order to be able to mount the volume groups for oracle files in shared
> mode in both servers? Or do we need to get MC/Service Guard with
> Extension for RAC? Some people said I dont need Service Guard at all
> while a few others said I need Service Guard with Ext for RAC. Which is
> true?

Ummm ... you need software to provide basic cluster services between the nodes even if no clustered file system is available.

That is what Service Guard does. So under 9iR2 you definitely need Service Guard whether you are running on files systems or RAW.

> Thanks.

There is a huge dramatic improvement in using RAW and direct io versus file systems thru a CFS. If you are going to run any kind of half way serious load I wouldn't think too much about the CFS file system implementation or would do some benchmarking.

Oracle and HP co-authored a study comparing RAW not long ago. I will try to dig it up. Received on Fri Sep 02 2005 - 07:52:07 CDT

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