RIchard, > its a dual xeon 2.4, 4gb ram and 3x identical 15k rpm scsi disks > > should i mirror 2 of the disks for postgres data, and use the 3rd disk for the > o/s and the pg logs or raid5 the 3 disks or even stripe 2 disks for pg and > use the 3rd for o/s,logs,backups ?
I'd mirror 2. Stripey RAID with few disks imposes a heavy performance penalty on data writes (particularly updates), sometimes as much as 50% for a RAID5-3disk config. I am a little curious why you've got a dual-xeon, but could only afford 3 disks .... -- -Josh Berkus Aglio Database Solutions San Francisco ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://archives.postgresql.org