Re: ASM disk groups
- From: "K Gopalakrishnan" <kaygopal@xxxxxxxxx>
- To: att755@xxxxxxxxxxx
- Date: Tue, 7 Mar 2006 10:20:12 -0800
Tim:
ASM uses SAME methodology internally and your data is striped and
mirrored across ALL avaiable disks. So I donot understand why would
you need a traditional split. If you need more redundancy, you can go
for triple mirroring from ASM or other mirroring at EMC level.
If you are worried about the meta data failures,corruptions.. I have
not seen any. But FYI, ASM Metadata also triple mirrored !
KG
On 3/7/06, Tim Onions <att755@xxxxxxxxxxx> wrote:
> Dear All
>
> Management have committed to getting a new EMC DMX3 top of the range SAN. We
> will be running a Linux RHEL4 10gR2 RAC database against it. We are some
> months away from go live so have lots of testing and such to do. However EMC
> are asking for the disk layout detalis now, and reading Oracle/EMC docs they
> say all we need is 2 ASM disk groups. The trouble is one will be 1.2Tb and
> contain all our datafiles (system, temp UNDO included) and that don't feel
> right. Changes to the EMC configuration will be expensive and impact other
> SAN usage if done later on.
>
> Does anyone have any practical experience on ASM on a SAN and are thus able
> to comment on whether Oracle docs are right in saying place all this data in
> a single disk group? Any good reasons for not opting for a more traditional
> split?
>
> TIA
>
> Tim Onions
>
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Best Regards,
K Gopalakrishnan
Co-Author: Oracle Wait Interface, Oracle Press 2004
http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/
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