Re: ASM - AIX 5.3 - 10.2 ( RAW or RAID) ?

madhu.vajrala_at_gmail.com wrote:
> Hello All,
>
> We are planning on using ASM, by understanding the benefits of it. I
> have couple of things that I am trying understand...
>
> 1. Is this possible to have External redundancy w/ RAW devices ?

Define "external redundancy"

> 2. What are the advantages or disadvantages that are associated w/
> using RAW devices or RAID when using with ASM ?

RAW and RAID and ASM are not mutually exclusive.

So, for example, I set up a 14 drive system in which drives 1-6 are configured as RAID5. They are raw devices. Then I use ASM to mirror them to drives 8-13 leaving drives 7 and 14 as hot spares.

Obviously I am using all three technologies at once.

The advantages that comes from ASM are load balancing, the ability to put multiple logical files onto (or is it into) a single raw device, and, of course, the mirroring and failure groups.

> 3. What is the role of failure groups, if we use external mirroring ?

Still don't understand how you are using the phrase "external mirroring." Define the hardware and the technology.

> I am not sure if i ask the above questions correctly, but I appreciate
> if someone educate me on this.
>
> Thank You,
> Madhu

HTH

-- 
Daniel A. Morgan
http://www.psoug.org
damorgan_at_x.washington.edu
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