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    SubjectRe: Eradic disk access during reads
    Date
    Willy Tarreau wrote:
    > 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.

    Tried the same with 2.4.31 which shows steady behaviour with occasional dips
    and pops in the msec range.

    >
    > > 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

    Does it have msec resolution?

    Thanks!

    --
    Al
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