__**STORAGE**__

**SAN**\\
Several categories:
  * FC: Block storage, FC. Dedicated switches.
  * FCoE: FC signalling over Ethernet protocol.
  * iSCSI: Still block storage but cheaper version. Encapsulated on Ethernet frames
\\
**NAS**: File server. File oriented. Less efficient

__**SDS (Software defined storage)**__
This is aiming see all the individual storage in the nodes (e.g.: local disks on blade servers) as a unique aggregated pool of storage.
From the virtualization perspective, the [[http://www.yellow-bricks.com/2013/04/24/re-is-vsa-the-future-of-software-defined-storage-openi/|VSA]] (virtual storage appliance ) captures any request for the storage from the guests and redirects to the 'pool of storage'