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Eran Tromer wrote:
> That's true in regard to writes, but for reads RAID1 is faster. For
> example, consider a system doing extensive reads concurrently from two
> files stored far apart on the (logical) disk. In RAID1 there are two
> copies of the data, each with an independent disk head assembly, so
> (with a good implementation) you'll end up having one disk serving the
> first file and the second serving the second file, and each will only do
> small disk head seeks. In RAID0, each disk contains the sole copy of
> half the data in each file, so the heads will have to do long seeks back
> and forth. A good disk scheduler would improve things somewhat, but the
> effect is still there.
>
It's RAID-0 here, so I expect the performance (read, write and overall)
to be better. What's ruining the performance is a disbalance between
disks. What causes this disbalance -- that's the question.
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