Re: jfs2 & 5.2 any performance issues?

From: John Jolet (john.jolet_at_FXFN.COM)
Date: 06/30/03

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    Date:         Mon, 30 Jun 2003 10:41:51 -0500
To: aix-l@Princeton.EDU

    dunno about jfs2 or 5.2, but aix always runs 99% used in memory. you have to look and see how much is computational and how much is noncomp (file cache). i would expect your file cache percent to be VERY high while backing up a filesystem, since aix will notice you keep reading from the same place and will keep increasing the readahead factor to get as much in memory as possible. were you truly swapping (as in "to paging space" was high)?
    -----Original Message-----
    From: Anthony F. Fiore [mailto:anthony.fiore@NYU.EDU]
    Sent: Monday, June 30, 2003 10:18 AM
    To: aix-l@Princeton.EDU
    Subject: jfs2 & 5.2 any performance issues?

    Good Day,

        I was wondering if anyone on the list has noticed any performance
    issues with JFS2 and AIX 5.2 ML-1, most notably memory issues. The
    reason I say this is because when I looked at one of my systems this
    morning, it was using 99% of it's memory and starting to swap like crazy
    according to nmon64. TSM was backing up a test filesystem at the time,
    so I killed the tsm process, and unmounted the jfs2 filesystem and poof!
    my memory usage went down to 31.5 percent while the filesystem was being
    unmounted. Granted, this is a huge filesystem in the 200 GB range, but
    should it really eat up THAT much memory?

    TIA,

    Anthony 

    --
Anthony Fiore
System Administrator
ITS Operations and Production Services
New York University
anthony.fiore@nyu.edu
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