Vivek,
> I did a bunch of testing with different RAID levels on a 14 disk
> array. I finally settled on this: RAID5 across 14 disks for the
> data, the OS (including syslog directory) and WAL on a RAID1 pair on
> the other channel of the same controller (I didn't want to spring for
> dual RAID controllers). The biggest bumps in performance came from
> increasing the checkpoint_buffers since my DB is heavily written to,
> and increasing sort_mem.
With large RAID, have you found that having WAL on a seperate array actually
boosts performance? The empirical tests we've seen so far don't seem to
support this.
--
-Josh Berkus
Aglio Database Solutions
San Francisco
