The dual xeon arrangement is because the machine will also have to do some collaborative filtering which is very cpu intensive and very disk un-intensive, after loading the data into ram.
On Friday 12 September 2003 5:49 pm, you wrote: > 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 .... ---------------------------(end of broadcast)--------------------------- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly