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Caches in Content-Centric Networks (CCN) are increasingly adopting flashmemory based storage. The current flash cache technology stores all files withthe largest possible expiry date, i.e. the files are written in the memory sothat they are retained for as long as possible. This, however, does notleverage the CCN data characteristics where content is typically short-livedand has a distinct popularity profile. Writing files in a cache using thelongest retention time damages the memory device thus reducing its lifetime.However, writing using a small retention time can increase the contentretrieval delay, since, at the time a file is requested, the file may alreadyhave been expired from the memory. This motivates us to consider a jointoptimization wherein we obtain optimal policies for jointly minimizing thecontent retrieval delay (which is a network-centric objective) and the flashdamage (which is a device-centric objective). Caching decisions now not onlyinvolve what to cache but also for how long to cache each file. We designprovably optimal policies and numerically compare them against prior policies.

Optimal Storage Aware Caching Policies for Content-Centric Clouds