> RAID controllers do not have half a terabyte of RAM. Also, you are always
quoted text
> invited to choose between speed (write back) and reliability (write through).

The write back ones are also battery backed properly, and will switched
to write through (flushing out the cache) on the first sniff of a low
battery signal.

The decent ones (the kind used in serious business) also let you swap the
battery backed RAM module to another card in the event of a failure of a
card so you can complete recovery.
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