Data consistency with RAID 5 and BBWC

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http://serverfault.com – I have a few questions about RAID 5, BBWC (Battery Backed Write Cache), filesystem (ext3) and optionally mysql. I have a hypothesis and I ask Server Fault community to validate or not this one: -The system is UP, applications works with database and use transactions -The RAID system is configured with RAID5,write caching and battery (BBWC) With this solution, when OS receive write ACK, data are possibly in the RAID controller cache, and not in a persistent memory (my RAID drives disk). If a power failure appears and data are in the RAID controller cache, the BBWC maintains data with the b (HowTos)