Hello!
We are observing very low performance of the 5- and 6-drive RAID5 array on the
LSILogic.
For formal comparision we created two logical drives -- a 5-drive RAID5 and a
1-drive RAID0. (All 6 disks are identical 200Gb Western Digital).
According to iozone, the 5-drive RAID5 gets from 3 to 8 Mb/s. The 1-drive
RAID0 goes from 20 to 50Mb/s.
Now, the controller has no battery and thus is not allowed to cache much, but
is the difference really supposed to be so great? It has 5 disks at its
disposal, after all...
-mi
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