> 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

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