On 30-Aug-05, at 14:32, Josh Berkus wrote:


The behavior we see is that when running queries that do random reads
on disk, IOWAIT goes over 80% and actual disk IO falls to a crawl at a
throughput bellow 3000kB/s (We usually average 40000 kB/s to 80000 kB/s
on sequential read operations on the netapps)

This seems pretty low for a NetApp -- you should be able to manage up to
180mb/s, if not higher.   Are you sure it's configured correctly?
Hi Josh,

The config has been reviewed by NetApp. We do get rates higher then 80mb/s, but on average, that's what we get.

Do you have NetApp filers deployed ?
How many spindles do you have in your volume ?
On which OS are you running Postgres ?




Josh Berkus
Aglio Database Solutions
San Francisco

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