From: Jan-Frode Myklebust (janfrode@PARALLAB.UIB.NO)
Date: Tue Oct 14 2003 - 12:54:16 EDT
On Tue, Oct 14, 2003 at 10:46:55AM +0100, Liddle Craig - cliddl wrote:
>
> Anyone out there using Oracle RAC in a GPFS, HACMP/ES environment?
Not Oracle, but I use GPFS in a HACMP/ES env..
>
> We are currently implementing this solution and are experiencing horrendous
> performance problems with GPFS (hanging, generally slow). AIX stats show the
> system isn't utilised at all (cpu, memory, disk)
>
The first thing that I think of is that GPFS has a very low
max pagepool limit of only 512 MB. So, while a JFS or JFS2 filesystem
happily will use your full 24 GB of memory as pagepool, the GPFS
filesystem might have to flush/read to/from disk a lot more often.
That can kill your performance.
-jf
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