On Tue, Dec 2, 2008 at 2:22 AM, Mario Weilguni <mweilguni@xxxxxxxx> wrote: > Has anyone benchmarked this controller (PCIe/4x, 512 MB BBC)? We try to use > it with 8x SATA 1TB drives in RAID-5 mode under Linux, and measure strange > values. An individual drive is capable of delivering 91 MB/sec sequential > read performance, and we get values ~102MB/sec out of a 8-drive RAID5, seems > to be ridiculous slow. Write performance seems to be much better, ~300 MB > /sec - seems ok to me. > > I guess I must be doing something wrong, I cannot believe that a 500 € > controller is delivering such poor performance. A few suggestions... Try to find the latest driver for your card, try using the card as nothing but a caching controller and run your RAID on software in linux (or whatever IS you're on). Test a 2 drive RAID-0 to see what kind of performance increase you get. If you can't dd a big file off of a RAID-0 at about 2x the rate of a single drive then something IS wrong with it. Try RAID 10. Try RAID-1 sets on the controller and RAID 0 over that in software. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
