Re: Paging space on a fastT

From: jbarratt (jbarratt_at_COMPSAT.COM)
Date: 01/14/04

  • Next message: Barnhart, Troy: "Re: What's wrong with autonegotiate" 
    Date:         Wed, 14 Jan 2004 12:25:10 -0500
To: aix-l@Princeton.EDU

    I assume many people are going to recommend you crank down minperm and
    maxperm, after that you might want to look at some of the other
    variables. Particularly maxpgahead (if you do a lot of consecutive
    reads), maxrandwrt if your I/O wait goes up when syncd runs, and
    lvm_bufcnt if the oracle instance under SAP resides on raw devices..
    Also be aware of necessary changes to minfree/maxfree due to some
    co/interdependencies

    Also be aware that if these are jfs2 filesystems, make the necessary
    changes to the j2_* parameters also

    -----Original Message-----
    From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU] On Behalf Of
    Wilson, Jeff
    Sent: Wednesday, January 14, 2004 11:55 AM
    To: aix-l@Princeton.EDU
    Subject: Re: Paging space on a fastT

    Here is my vmtune results .

    vmtune: current values:
      -p -P -r -R -f -F -N
    -W
    minperm maxperm minpgahead maxpgahead minfree maxfree pd_npages
    maxrandwrt
     401040 1604160 2 8 120 128 65536
    0

      -M -w -k -c -b -B -u -l
    -d
    maxpin npswarn npskill numclust numfsbufs hd_pbuf_cnt lvm_bufcnt
    lrubucket defps
    1677709 88064 22016 1 186 1152 9
    131072 1

            -s -n -S -L -g
    -h
    sync_release_ilock nokilluid v_pinshm lgpg_regions lgpg_size
    strict_maxperm
            0 0 0 0 0 0

        -t -j -J -z
    maxclient j2_nPagesPer j2_maxRandomWrite j2_nRandomCluster
    1604160 32 0 0

        -Z -q -Q -y
    j2_nBufferPer j2_minPageReadAhead j2_maxPageReadAhead memory_affinity
          512 2 8 0

        -V -i
    num_spec_dataseg spec_dataseg_int
          0 512

    PTA balance threshold percentage = 50.0%

    number of valid memory pages = 2097136 maxperm=80.0% of real memory
    maximum pinable=80.0% of real memory minperm=20.0% of real memory
    number of file memory pages = 1287466 numperm=64.2% of real memory
    number of compressed memory pages = 4409 compressed=0.2% of real
    memory
    number of client memory pages = 0 numclient=0.0% of real memory
    # of remote pgs sched-pageout = 0 maxclient=80.0% of real memory

    Jeff Wilson

    -----Original Message-----
    From: Bob.Kelley@BRINKSINC.COM [mailto:Bob.Kelley@BRINKSINC.COM]
    Sent: Wednesday, January 14, 2004 9:21 AM
    To: aix-l@Princeton.EDU
    Subject: Re: Paging space on a fastT

    what version of aix are you running? check your vmtune settings and post
    pls

    Bobby Kelley Jr.
    972-877-5341

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      | Subject: Re: Paging space on a fastT
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    >-----------------------------------------------------------------------
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    We are running the paging monster app "SAP on DB2". I have never seen
    an app eat paging space like this one. If we bounce SAP we get it all
    back but until we do that SAP keeps all the paging space and dose not
    release it. As always the recommend 2 X physical memory but with the
    new SAP installs they want 3 X physical memory which is ridicules but I
    have no choice in the matter so I have to add it even if they don't need
    it.

    Jeff Wilson
    303-737-5399
          -----Original Message-----
          From: JOSEPH KREMBLAS [mailto:jkremblas@REDHEARTGIFTS.COM]
          Sent: Wednesday, January 14, 2004 8:34 AM
          To: aix-l@Princeton.EDU
          Subject: Re: Paging space on a fastT

          Jeff,

              Before throwing more paging space at the system, have you ran
          vmstat and iostat to see what the system is doing? Can you provide
    a
          vmstat listing and iostat listing? Are you running Oracle? Any
    other
          databases? Also, provide the output of vmtune and schedtune. The
          group may be able to tell what's going on performance wise and
    make
          some recommedations.

                  --joseph
          -----Original Message-----
          From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU] On
    Behalf
          Of Wilson, Jeff
          Sent: Wednesday, January 14, 2004 8:27 AM
          To: aix-l@Princeton.EDU
          Subject: Paging space on a fastT
          I was wondering if anyone has had any experience putting paging
    space
          on attached disks like a fastT 900. I am out of space on my
    internal
          OS disks and need more paging space and was wondering if there are
          any problems I should be aware of before I do this. Thanks for
    you
          help.

          Jeff Wilson
          System Administrator
          Great-West Life & Annuity Ins. Co.
          Desk: (303) 737-5399

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  • Next message: Barnhart, Troy: "Re: What's wrong with autonegotiate"

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