>Given a system with 32 cores, an SSD SAN with 48x drives, and 2x 8Gbps >paths from the server to the SAN, what would be a good starting point >to set effective_io_concurrency? I currently have it set to 32, but I >kind of feel like the right setting would be "2" since we have two >paths. We don't often saturate both links but it does happen from >time to time. One assumption about optimal value is that, it is usually the number of data drives participating in the I/O system excluding the parity drives. here is the article about setting it in Postgres Plus Advanced Server. Have a look at it if you find it useful for normal PostgreSQL setup: http://www.enterprisedb.com/docs/en/8.3R2/perf/Postgres_Plus_Advanced_Server_Performance_Guide-17.htm ----- Greetings, Samrat Revagade, NTT DATA OSS Center Pune, India. -- View this message in context: http://postgresql.1045698.n5.nabble.com/effective-io-concurrency-with-an-SSD-SAN-tp5768029p5768570.html Sent from the PostgreSQL - general mailing list archive at Nabble.com. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
