Re: Redo Log Diskgroup

From: Mark D Powell <>
Date: Tue, 12 Aug 2008 10:34:43 -0700 (PDT)
Message-ID: <>

On Aug 12, 10:34 am, howard <> wrote:
> Hello,
> I want to know if it is recommended best practice to have 3 ASM disk
> group on a Windows 2003 RAC?
> I would have a:
> +DATA diskgroup for datafiles, a control file
> +REDO for storage of redo logs for BOTH nodes
> +FLASH for RMAN backup sets and archivelogs
> I guess what I'm getting at, has anyone read that there can be too
> many diskgroups within a ASM
> instance?
> Thanks,
> Howard

Your arrangement sounds logical to me. You will also want if at all possible to use different physical drives under the ASM diskgroups. Most sites hand ASM logical devices rather than true physical devices and I for one would like to know for a fact that my disk based database backup file copies/sets really are on different physical drives from my database files.

If ASM can have too many diskgroups it is a number more than 3.

HTH -- Mark D Powell -- Received on Tue Aug 12 2008 - 12:34:43 CDT

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