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filesystems & performance - AIX

Hi! Does anybody know or anybody could give me a hint on the matter of whether the number of file systems defined in a RS/6000 running AIX 4.3.3 or 5.2 affects overall performance?...

  1. #1

    Default filesystems & performance

    Hi!

    Does anybody know or anybody could give me a hint on the matter of whether
    the number of file systems defined in a RS/6000 running AIX 4.3.3 or 5.2
    affects overall performance?


    David Barrientos Fernández Guest

  2. #2

    Default Re: filesystems & performance

    "David Barrientos Fernández" <david.barrientositesm.mx> wrote:
    DBFn> Hi!

    DBFn> Does anybody know or anybody could give me a hint on the matter of whether
    DBFn> the number of file systems defined in a RS/6000 running AIX 4.3.3 or 5.2
    DBFn> affects overall performance?

    I wouldn't expect the number of filesystems *mounted* on a machine
    to matter a great deal. Usually, only a small amount of the work
    done by file-related system calls (open, close, read, write, etc.)
    has anything to do with the mount point itself. Needless to say,
    this particular overhead is sorta hard to avoid. And I dare say
    that it's marginal enough for you not to have to worry about it.

    The only way having lots of filesystems could affect performance
    is if an oft-used file-related system call has, say, to look up a
    filesystem mount point structure in the kernel *every* time it's
    called, *and* if the way of looking up the structure is at least
    O(N), where N is the number of mount points. So, if those conditions
    were true, and you had maybe a few thousand filesystems mounted on
    the machine, then you might see some performance degradation.

    Do you have a *reason* to believe that the number of filesystems
    you have mounted on your machine is actually affecting performance?
    I think this is the second time you've posted the question. Why
    the persistence? Are you just curious or do you think there's a
    problem?

    Regards,

    Nicholas

    --
    "Why shouldn't I top-post?" [url]http://www.aglami.com/tpfaq.html[/url]
    "Meanings are another story." [url]http://www.ifas.org/wa/glossolalia.html[/url]
    Nicholas Dronen Guest

  3. #3

    Default Re: filesystems & performance

    > Do you have a *reason* to believe that the number of filesystems
    > you have mounted on your machine is actually affecting performance?
    > I think this is the second time you've posted the question. Why
    > the persistence? Are you just curious or do you think there's a
    > problem?
    Oh, I expect the "df -k" from a serial console take a bit longer on a
    machine with 1000 mounted filesystems ;-). Can produce some wait I/O on
    tty0.

    The time can be further increased by mounting some NFS shares.

    ---
    Uli

    Ulrich--nO--(dot)-sPAM--Link Guest

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