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Re: Postgres, fsync and RAID controller with 100M of internal cache & dedicated battery

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On Wed, 22 Aug 2007, Ron Johnson wrote:

That seems to be a very extreme ratio.  Most databases do *many*
times more reads than writes.

Yes, but the OS has a lot more memory to cache the reads for you, so you should be relying more heavily on it in cases like this where the card has a relatively small amount of memory. The main benefit for having a caching controller is fsync acceleration, the reads should pass right through the controller's cache and then stay in system RAM afterwards if they're needed again.

--
* Greg Smith gsmith@xxxxxxxxxxxxx http://www.gregsmith.com Baltimore, MD

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