Quoting Josh Berkus <josh(at)agliodbs(dot)com>:
> The first and most important step for RAID performance with PostgreSQL is to
> get a card with onboard battery back-up and enable the write cache for the
> card. You do not want to enable the write cache *without* battery back-up
I'm curious about this -- how do you avoid losing data if a cache stick dies?
Without redundancy, whatever hasn't been destaged to the physical media vanishes
Dual-controller external arrays (HDS, EMC, LSI, etc.) tend to mirror (though
algorithms vary) the cache in addition to battery backup. But do onboard arrays
tend to do this as well?
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