I'm sure there's some corner case where more memory helps. If you consider that 1GB of RAM is about $100, I'd max out memory on the controller just for the hell of it.

Josh Berkus wrote:


Past recommendations for a good RAID card (for SCSI) have been the LSI
MegaRAID 2x. This unit comes with 128MB of RAM on-board. Has anyone
found by increasing the on-board RAM, did Postgresql performed better?

My informal tests showed no difference between 64MB and 256MB.

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