Data Integrity, or, raid+cache+battery backup

In the last two weeks I've had two enquiries from customers about caching on their raid arrays. In both cases the customers said (words to the effect of) "we want to get the speed benefits from the array's cache, but we don't want to pay for battery backup." (or, "we don't want to replace the battery on our T3/6x20" ) In each case (and in any case like this) the answer is a resounding NO! Why do you think that Sun and other hardware raid vendors design in battery-backup? We worry about the availability and integrity of your data. You should too.
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I work at Oracle in the Solaris group. The opinions expressed here are entirely my own, and neither Oracle nor any other party necessarily agrees with them.

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