That might be true for "classic" drives, but I think it becomes less important with SSD (which OP is going to use), because SSDs come with much large own cache. Typically HDD cache size is somewhere between 16MB and 128MB, while common cache size for SSD is 512MB - 2GB. There is no need to cache the same data twice (in raid-controller cache, and in ssd-cache)...
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