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    SubjectRe: [Announce] device-mapper beta3 (fast snapshots)
    On Tue, 2002-07-16 at 12:31, Joe Thornber wrote:

    > > Joe, are you absolutely sure these tests had the disk cache disabled? That's
    > > the only hardware thing I can think of that would make a difference.
    > Absolutely sure. Those figures were for a pair of PVs that were
    > sharing an IDE cable so I can certainly get things moving faster.

    Some IDE drives ignore commands to turn off the write back cache, or
    turn it back on when load gets high.

    Try iozone -s 50M -i 0 -o with writeback on and off. If you get the
    same answer the benchmarks are suspect....


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