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    SubjectRe: File system compression, not at the block layer
    Date
    "Richard B. Johnson" <root@chaos.analogic.com> writes:

    > On Fri, 23 Apr 2004, Joel Jaeggli wrote:
    >
    >> On Fri, 23 Apr 2004, Paul Jackson wrote:
    >>
    >> > > SO... in addition to the brilliance of AS, is there anything else that
    >> > > can be done (using compression or something else) which could aid in
    >> > > reducing seek time?
    >> >
    >> > Buy more disks and only use a small portion of each for all but the
    >> > most infrequently accessed data.
    >>
    >> faster drives. The biggest disks at this point are far slower that the
    >> fastest... the average read service time on a maxtor atlas 15k is like
    >> 5.7ms on 250GB western digital sata, 14.1ms, so that more than twice as
    >> many reads can be executed on the fastest disks you can buy now... of
    >> course then you pay for it in cost, heat, density, and controller costs.
    >> everthing is a tradeoff though.
    >>
    >
    > If you want to have fast disks, then you should do what I
    > suggested to Digital 20 years ago when they had ST-506
    > interfaces and SCSI was available only from third-parties.
    > It was called "striping" (I'm serious!). Not the so-called
    > RAID crap that took the original idea and destroyed it.
    > If you have 32-bits, you design an interface board for 32
    > disks. The interface board strips each bit to the data that
    > each disk gets. That makes the whole array 32 times faster
    > than a single drive and, of course, 32 times larger.

    For best performance, the spindles should be synchronized too. This
    might be tricky with disks not intended for such operation, of course.

    --
    Måns Rullgård
    mru@kth.se

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