Re: Oracle 9i RAC, AIX and GPFS

From: Jan-Frode Myklebust (janfrode_at_PARALLAB.UIB.NO)
Date: 10/14/03

  • Next message: Liddle Craig - cliddl: "Re: Oracle 9i RAC, AIX and GPFS" 
    Date:         Tue, 14 Oct 2003 18:54:16 +0200
To: aix-l@Princeton.EDU

    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

  • Next message: Liddle Craig - cliddl: "Re: Oracle 9i RAC, AIX and GPFS"

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