Re: Data Mirroring on two data centers -- How to use ASM ?

From: "LS Cheng" <exriscer@xxxxxxxxx>
To: db.mail.1@xxxxxxxxx
Date: Thu, 18 May 2006 20:20:15 +0200

Hi

I am talking with Logic so I might be wrong

1. ASM is itself sort of a Volume Manager, it manages the RAW disks so I
doubt it very much you can use a Volume Manager to manage ASM disks.

2. ASM Stripes your SAN logical volumes, i dont think it would affect your
I/O performance

On 5/18/06, Madhu V <db.mail.1@xxxxxxxxx> wrote:


 Hello All,

We are planning on testing a two node 10g RAC using ASM for one of our
database on pSeries using AIX 5.3. We have a primary requirement of
mirroring data across TWO data centers (Hitachi SAN).  I have two questions

1. Mirroring.

   Can we use AIX Volume Manager to take care of the mirroring or ASM to
do mirroring. I am specifically looking for HOW and WHY?

2. Striping

    I have seen a similar post just a few days ago on ASM striping,
although i couldn't understand much of it (Pardon my knowledge on disk
technologies). Our storage folks told me that, they have a huge disk cache
(128 GB) and very high performing SAN (HDS 9980) w/ excellent algorithm for
striping the LUNS across multiple disks. So HOW best I can use ASM striping
along w/ HDS storage striping? or will it cause any performance problems??

Please advise me...

Good Day,
Madhu

References:
- Data Mirroring on two data centers -- How to use ASM ?
  - From: Madhu V

Re: Data Mirroring on two data centers -- How to use ASM ?

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