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    SubjectRe: Eradic disk access during reads
    On Sat, Sep 17, 2005 at 07:26:11AM +0300, Al Boldi wrote:
    > Monitoring disk access using gkrellm, I noticed that a command like
    >
    > cat /dev/hda > /dev/null
    >
    > shows eradic disk reads ranging from 0 to 80MB/s on an otherwise idle system.
    >
    > 1. Is this a hardware or software problem?

    Difficult to tell without more info. Can be a broken IDE disk or defective
    ribbon.

    > 2. Is there a lightweight perf-mon tool (cmd-line) that would log this
    > behaviour graphically?

    You can do " readspeed </dev/hda | tr '\r' '\n' > log " with the readspeed
    tool from there :
    http://w.ods.org/tools/readspeed

    Then you just have to graph $6 (kB/s) versus $1 (bytes read). There may
    be other tools which do all this automatically though.

    Regards,
    Willy

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