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A single controller ''may'' use different protocols for back-end and for front-end communication. Many enterprise controllers use FC on front-end and SATA on back-end.
== Enterprise controllers ==''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
{{main|Disk array}}
In a modern enterprise architecture disk array controllers (sometimes also called '''storage processors''', or '''SPs'''<ref>http://vmtoday.com/2010/03/storage-basics-part-v-controllers-cache-and-coalescing/</ref>) are parts of physically independent [[disk enclosure|enclosure]]s, such as [[disk array]]s placed in a [[storage area network]] (SAN) or [[network-attached storage]] (NAS) [[Server (computing)|server]]s.
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