Re: ASM IO distribution on a SAN
- From: "Alex Gorbachev" <ag@xxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Thu, 13 Sep 2007 14:33:37 -0400
Striping-over-striping kind of defeats the simplicity of ASM
environment and completely removes visibility where is what in regard
to physical storage layout.
If situation permits, I strongly prefer to expose each pair of RAID-0
mirrored disks as single LUN and organize diskgroups out of those
LUNs. This way ASM disk matches directly to a single physical disk (oh
well, pair of disks).
On 9/13/07, Matthew Zito <mzito@xxxxxxxxxxx> wrote:
> It is unlikely your storage array has the capability to present a multi-TB
> lun, or that from an administrative perspective you would want such a thing.
> ASM would be a fine way to evenly distribute IO across a series of
> reasonably sized LUNs. I think Paul's point was to not count on the
> striping from a performance perspective, simply an administrative ones.
--
Alex Gorbachev, Oracle DBA Brewer, The Pythian Group
http://www.pythian.com/blogs/author/alex http://www.oracloid.com
BAAG party - www.BattleAgainstAnyGuess.com
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