Did some testing this weekend with the new Adaptec 5805. Since I wanted to see what this card could do, I decided to try it with some cheap Seagate Savvio 15k.1 36.7GB SAS drives. Overall performance is fine, however there was a consistently interesting note in ATTO’s benchmark at 64k. I tried every stripe size imaginable, and there was a distinct fall-off every time in read speeds. I also tried the newest firmware, same result. Truly odd indeed.
8x Seagate Savvio 15k Raid 5 Adaptec 5805
Notice the dip in read performance at 64k. This seems to be very strange and did not go away with three different firmware versions.
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