ASM - number of LUNS rule of thumb
Date: Wed, 11 Aug 2010 16:13:24 +0100
Message-ID: <A4AF649BCC498F47B854200B42DEC119087F23D8_at_MSAS-LDN90P.global.gam.com>
I wanted to ask the list some advice on a particular ASM "rule-of-thumb" and advice on diskgroups per host.
We have recently decided upon using ASM, yes I know late to the party, we have studied quite a few white papers and they often suggest that you start somewhere between 4 to 8 luns maximum per diskgroup as a rule-of-thumb. I don't like rules-of-thumb, they suggest that no-one has any idea and it's a best guess! What do others have as a starting point basis for the number of raw luns under each diskgroup and why that number? I appreciate there are many more factors involved and we are slowly working through lots of these, but I am trying to get some facts based on experience, rather than simply taking documented suggestions as gospel truth.
Additionally, my colleague and I are arguing over the merits of the number of diskgroups per host. Say you have 4 instances on a host, does each instance have at least two diskgroup each ( DATA+FRA for example) , or do you simply make big diskgroup and throw all the instances into it? The "all-in-one" options suggest 'eggs-in-one-basket to me though.
Any advice from your vast collective experience on these two points, would be greatly appreciated.
Rgds George Johnson
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