> I am expecting the faster performance on READ than WRITE because of
> parallel read from disks more than 2(2 for RAID1, 3 for RAID0) at the
> same time.
if I understand your description, each of your tests involves either
reading or writing from a single disk (and also writing/reading a raid.)
such tests will always run at the speed of the slowest disk,
presumably the single one. for instance,
cp /some-2-disk-raid0/file /other-single-disk/
will be limited by the write speed of other-single-disk,
and not the raid.
cp /other-single-disk/file /some-2-disk-raid0/
is similar, though now it's the reading from a single disk which
is the bottleneck.
> Any suggestion or opinion?
test bandwidth with something more reasonable than time cp.
even "time dd if=/disk-to-read-from of=/dev/zero bs=64k"
is more sensible.
regards, mark hahn.
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