[EMAIL PROTECTED] wrote:

> Next we'll upgrade the postgres hardware, and then I'll come
> back to report if it's working better... sorry for the noise for now.

There have been some discussions about which hardware suits PostgreSQL's
needs best under certain load-characteristics. We have experienced quite
a write-performance burst just from switching from a RAID5-config to a
RAID10 (mirroring&striping), even though we had been using some
supposedly sufficiently powerful dedicated battery-backuped
SCSI-RAID-adapters with lots of on-board cache. You can't beat simple,
although it will cost disk-space. Anyway, you might want to search the
archives for discussion on RAID-configurations.

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