On Tue, Dec 9, 2008 at 9:03 AM, Gabriele Turchi <gabriele.turchi@xxxxxxxx> wrote: > We reached a fairly good performance on a P400 controller (8 SATA 146GB 2,5" > 10k rpm) with raid5 or raid6 Linux software raid: the writing bandwidth > reached about 140 MB/s sustained throughput (the hardware raid5 gave a > sustained 20 MB/s...). With a second, equal controller (16 disks) we reached > (raid6 spanning all 16 disks) about 200 MB/s sustained. That's better than you were getting but still quite slow. I was bothered that my 12x15k4 SAS RAID-10 array could only sustain about 350Megs/second sequential read, thinking that each drive should be able to approach 80 or so megs/second and I was only getting about 60... This sounds more and more like HP is trying to undercompete along with Dell in the RAID controller market or at least the raid controller driver market. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
