Scott Marlowe <scott.marl...@gmail.com> writes: > We purhcased the Perc 5E, which dell wanted $728 for last fall with 8 > SATA disks in an MD-1000 and the performance is just terrible. No > matter what we do the best throughput on any RAID setup was about 30 > megs/second write and 60 Megs/second read.
Is that sequential or a mix of random and sequential (It's too high to be purely random i/o)? A single consumer drive should be able to beat those numbers on sequential i/o. If it's a mix of random and sequential then performance will obviously depend on the mix. > I can get that from a mirror set of the same drives under linux kernel > software RAID. Why is that surprising? I would expect software raid to be able to handle 8 drives perfectly well assuming you had an controller and bus you aren't saturating. -- Gregory Stark EnterpriseDB http://www.enterprisedb.com Ask me about EnterpriseDB's On-Demand Production Tuning -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
