>>I've heard that it is important to disable disk caching on the faster drives. Is that correct?
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>Where did you hear that? Disabling disk cache WILL decrease performance A LOT. That defeats the purpose of 15K drives.

Might have been in discussions on ***other*** back ends, as non-battery-backed caching might make data less ACID-safe.
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>>We're having difficulty turning off the cache on one of the machines and our hardware guy wants to make sure this is what we want.
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>And rightfully so. Bear in mind that sometimes high-performance drives are attached to controllers that implement a cache in hardware, and which can't be turned off.

But there the better ones *are* not prone to lose data on the flip of a switch ;-)