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How do I increase NBUF safely? - SCO

[email]mynews44[/email] (google account) wrote in message news:<e84f5d12.0306242103.6fefa11posting.google.c om>... > Hello... > > My OpenServer 5.0.6 system seems to be suferring random go slows, and > I am getting data out of sar suggests strongly that it is a disk > system bottleneck and I should increase my NBUF to cope better with > it... My big issue is that I really have absolutley no idea how to > increase the NBUF figure, nor do I know how much to increase it by so > as not to run myself low of memory in the system > > Can someone let ...

  1. #1

    Default Re: How do I increase NBUF safely?

    [email]mynews44[/email] (google account) wrote in message news:<e84f5d12.0306242103.6fefa11posting.google.c om>...
    > Hello...
    >
    > My OpenServer 5.0.6 system seems to be suferring random go slows, and
    > I am getting data out of sar suggests strongly that it is a disk
    > system bottleneck and I should increase my NBUF to cope better with
    > it... My big issue is that I really have absolutley no idea how to
    > increase the NBUF figure, nor do I know how much to increase it by so
    > as not to run myself low of memory in the system
    >
    > Can someone let me know...? Or point me to instructions?
    >
    > Just incase it make a difference, the system itself is an Intel Mobo
    > with dual P3 Xeon processors and 1Gig of physical memory. I beleive
    > it has been configured to have 3gig swap. The disk system is a SCSI
    > RAID5 + hotspare thing, with 4 10000rpm 36g scsi drives...
    >
    > Thanks
    >
    > googleboy.
    Increase NBUF to maximum value:
    idtune -m NBUF 450000
    Then relink kernel and reboot.

    Andrey Bondar, SysAdmin,
    T.I.P.A.S. Ltd., Lithuania
    Andrey Bondar Guest

  2. #2

    Default Re: How do I increase NBUF safely?

    google account wrote:
    >
    > Hello...
    >
    > My OpenServer 5.0.6 system seems to be suferring random go slows, and
    > I am getting data out of sar suggests strongly that it is a disk
    > system bottleneck and I should increase my NBUF to cope better with
    > it... My big issue is that I really have absolutley no idea how to
    > increase the NBUF figure, nor do I know how much to increase it by so
    > as not to run myself low of memory in the system
    >
    > Can someone let me know...? Or point me to instructions?
    >
    > Just incase it make a difference, the system itself is an Intel Mobo
    > with dual P3 Xeon processors and 1Gig of physical memory. I beleive
    > it has been configured to have 3gig swap. The disk system is a SCSI
    > RAID5 + hotspare thing, with 4 10000rpm 36g scsi drives...
    >
    > Thanks
    >
    > googleboy.
    On a different angle, if your raid controller support RAID 1+0, then
    reconfigure your hard drives. You will have to unload/reload with a
    supertar.

    I have seen RAID 5 causing a bottleneck, normally with a database and
    numerous small writes. The RAID 1+0 has better performance in the same
    test. With a three drive RAID 5 and one spare you can sustain a single
    hard drive failure without loss of data ( performance will be hurt even
    more during the rebuild ) but a second failure will cause a total volume
    loss. With RAID 1+0 you can have a single drive failure with no loss
    of data ( performance degredation will occur when the failed drive is
    replaced, but its less noticable then with RAID 5 ), and it is possible
    that a second hard drive can fail without the volume going down. A third
    failure before any drive replacement will always kill it. So RAID 1+0
    is no less secure than RAID 5, has better performance and you already
    own the four drives.

    Mike

    --
    Michael Brown

    The Kingsway Group
    Mike Brown Guest

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