> In particular - could someone tell me if those iostat
> values can tell if I'm close to upper performance boundary
> of fast SCSI (Ultra 320, 15k RPM) disks? 

It's quite possible that you need to improve your disk array; certainly I 
would have spec'd a lot more disk than you're using (like raid 0+1 with 6 
disks or RAID 5 with seven disks).

However, there's the other end as well; it's quite possible that your queries 
are doing seq scans and other disk-intensive operations that could be 
avoided.   Have you analyed this at all?

-Josh Berkus
 Aglio Database Solutions
 San Francisco

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