Re: Subject: RE: ASM - number of LUNS rule of thumb
- From: David Robillard <david.robillard@xxxxxxxxx>
- To: Andrew Bryant <adb@xxxxxxxxxxxx>
- Date: Fri, 13 Aug 2010 11:26:35 -0400
Hello everyone,
On Fri, Aug 13, 2010 at 10:50 AM, Andrew Bryant <adb@xxxxxxxxxxxx> wrote:
> Ø Is that documented anywhere? Any reason why performance will suffer? I
> can understand on normal and high redundancy, but I cant figure out what
> difference it would make on external redundancy.
Check the webinar given by Frits Hoogland on the oracleracsig.org
website entitled "ASM: advantages and disadvantages".
<quote>
Oracle is positioning ASM as the resolution for resolving storage and
I/O problems. Is this true? Or does ASM have advantages and
disadvantages and do you need to make a choice depending on your
specific situation? This presentation shows how ASM works, and
discusses the basic storage choices, like not using ASM, redunancy
levels and using ASMLib. Learn about ASM and its characteristics!
</quote>
You can see the entire presentation in the archives and it explains
how ASM works and why you need LUNs of equal sizes.
It also suggests to stay away from ASMLib and use udev instead. Which
is a very good idea!
HTH,
David
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