Re: performance optimzations

On Wed, 2003-11-12 at 12:34, Suchandra Thapa wrote:
> I'm moving a webmail service over to use a postgresql database for
> storage and wanted to get any tips for optimizing performance.  The
> machine will be a multiprocessor (either 2 or 4 cpu ) system with a raid
> array.  What layout should be used?  I was thinking using about using a
> raid 1+0 array to hold the database but since I can use different array
> types, would it be better to use 1+0 for the wal logs and a raid 5 for
> the database?

How much in total storage?  If you have (or will have) > ~6 disks, go
for RAID 5 otherwise 10 is probably appropriate.

> The database gets fairly heavy activity (the system handles about 500MB
> of incoming and about 750MB of outgoing emails daily).  I have a fairly
> free rein in regards to the system's layout as well as how the
> applications will interact with the database since I'm writing the
> code.

These are archived permanently -- ~450GB of annual data? Or is the data
removed upon delivery?