In this session Duncan and John will discuss what a typical day looks like in the life of an I/O (on a VSAN based solution). How does network based RAID-1 or RAID-5 work? Where does checksumming occur? When and how are blocks deduplicated or compressed? What about caching, are there different layers? Can I control where blocks are stored? And how does all of this influence availability and performance of my I/O?