Storage Types

There are 3 types of Storage (2 over Network and which is NAS and SAN, and the other is Directly attached which called DAS )

DAS is a block device from a disk which is physically [directly] attached to the host machine.

You must place a filesystem upon it before it can be used.

Technologies to do this include IDE, SCSI, SATA, etc.

SAN is a block device which is delivered over the network.

Like DAS you must still place a filesystem upon it before it can used.

Technologies to do this include FibreChannel, iSCSI, FoE, etc.

NAS is a filesystem delivered over the network.

It is ready to mount and use.

Technologies to do this include NFS, CIFS, AFS, etc