On Tue, 2008-12-09 at 09:25 -0700, Scott Marlowe wrote: > 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. It is certainly possible. The 400 is the higher end of the lower end with HP... 200, 400, 600, 800 (800 is a nice controller). Joshua D. Drake > -- PostgreSQL Consulting, Development, Support, Training 503-667-4564 - http://www.commandprompt.com/ The PostgreSQL Company, serving since 1997 -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
