Hell, Robert wrote: > We have a PostgreSQL 8.2.7 database (~230 GB) running on a machine with 8 > Intel Xeon Cores and 32 GB RAM (64-bit Linux 2.6.18). Data is stored on an > EMC² CLARiiON on RAID 1/0 (8 x 146 GB 15k rpm). > When we do random I/O with a small test tool (reading random 8k blocks from > big files in 200 threads) on the disk we retrieve data with about 25 MB/s.
How do you test random IO? Do you use this utility: http://arctic.org/~dean/randomio/ ? If not, try using it, with same parameters. It might be that the latency is destroying your performance. Do you use NFS or are you accessing the storage as SAN? -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
