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    SubjectRe: Eradic disk access during reads
    Date
    Willy Tarreau wrote:
    > On Sat, Sep 17, 2005 at 01:32:53PM +0300, Al Boldi wrote:
    > > 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.

    New synonym: eradic=erratic :)

    > Denis' tool seems clearly more suited to analyse your problem.

    The problem seems to be a multi-access collision in the queue, which forces a
    ~50% reduction of thruput, which recovers with another multi-access
    collision. Maybe?!

    --
    Al

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