Storage virtualisation is a technology that’s been around for many years and acts to abstract, in some form, the physical hardware from the LUN or volume the host/user sees.  The aim is to use this abstraction to reduce management overhead (for example with transparent migrations), to provide an ingest path (e.g. moving data from a local to shared storage platform), to extend the life of external resources or to manage I/O performance.

The most well known implementations from a hardware perspective are probably IBM’s SVC (SAN Volume Controller) and Hitachi/HDS’s USP/VSP…