Michael Guntsche wrote:
Is it possible that my computer is just too slow to get good read results?
unlikely
While reading is a little bit faster it's nowhere near the speed I get on
md0 itself.
I would guess that you did not set the correct read-ahead values for the LV.
If you do not specify anything it will default to 128k (256 sectors), which is
terribly small for sequential reads. On the contrary the MD device will do
some clever calculations and set its read-ahead correctly depending on the
raid level and the number of disks. Do:
blockdev --setra 65536 <your lv device>
and run the tests again. You are almost certainly going to get the results you
are after.
Peter
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