Kevin Grittner wrote: > Another example of why I shouldn't trust my memory. Per the > hardware tech: > > > OS: /dev/sda is RAID1 - 2 x 2.5" 15k SAS disk > pg_xlog: /dev/sdb is RAID1 - 2 x 2.5" 15k SAS disk > > These reside on a ServeRAID-MR10k controller with 256MB BB cache. > > > data: /dev/sdc is RAID5 - 30 x 3.5" 15k SAS disk > > These reside on the DS3200 disk subsystem with 512MB BB cache per > controller and redundant drive loops. Hmm, so maybe the performance benefit is not from it being on a separate array, but from it being RAID1 instead of RAID5? -- Alvaro Herrera http://www.CommandPrompt.com/ PostgreSQL Replication, Consulting, Custom Development, 24x7 support -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
