Bo, > 2 - 2.4 Ghz Xeon processors > 4GB ram > 4 36gb 10000rpm scsi drives configured for raid 10
Hopefully you've turned OFF hyperthreading? > gains can I expect on average from swapping from 4 disk raid 10 to 14 disk > raid 10? Could I expect to see 40 - 50% better throughput. This is so dependant on application design that I can't possibly estimate. One big gain area for you will be moving the database log (pg_xlog) to its own private disk resource (such as a raid-1 pair). In high-write enviroments, this can gain you 15% without changing anything else. > The servers listed above are the dell 2650's which have perc 3 > controllers. I have seen on this list where they are know for not > performing well. So any suggestions for an attached scsi device would be > greatly appreciated. Also, any thoughts on fibre channel storage devices? The 2650s don't perform well in a whole assortment of ways. This is why they are cheap. NetApps seem to be the current best in NAS/SAN storage, although many people like EMC. Stay away from Apple's XRaid, which is not designed for databases. -- --Josh Josh Berkus Aglio Database Solutions San Francisco ---------------------------(end of broadcast)--------------------------- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match