Q: What do you get when you mix Facebook’s (s fb) extensive memcached usage with its strategy of “cold storage” for infrequently accessed data? A: McDipper, a Facebook-built implementation of the popular memcached key-value store designed to run on flash memory rather than pricier DRAM. Memcached, for the unfamiliar, is an open-source key-value store that caches frequently accessed data in memory