Unfortunately, when things seem too good to be true....
I have to go back to the beginning. I had switched to a system with HDD's, but hadn't noticed that the system has a cache that was skewing my results. My test script attempts to turn off the cache, but in this case, it's ignored since the cache is battery backed, and therefore knows that I really want it on.
Also, I thought the drives were 10k RPM. If that's the case, then 270 MB/s would be a fairly reasonable TP on the outer edge. However, these are 7.2k RPM drives and aren't able to do anywhere near 270 MB/s. The cache was skewing that result as well.
So... please ignore any message in which I claim to get 1080 MB/s from a RAID6.
Bob Kierski
Senior Storage Performance Engineer
Cray Inc.
380 Jackson Street
Suite 210
St. Paul, MN 55101
Tele: 651-967-9590
Fax: 651-605-9001
Cell: 651-890-7461
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