storage for virtualization

https://wiki-site.win/index.php/Why_Flash-Optimized_Storage_Matters_for_Modern_Data_Centers

For virtualization, storage needs to be flexible and fast, often using SAN or NAS to share disk space across multiple virtual machines at once. It must handle snapshots and clones easily without bogging down, and flash storage helps keep I/O snappy when many VMs are running. Good storage design stops one virtual server from hogging all the IOPS and makes upgrades painless.