SAN: Storage Area Network

•Block Oriented Access To Data

•Unique Writer

•I/O Protocol: SCSI, HIPPI, IPI

•“Back-end” Network

NAS and SAN

•NAS – Network Attached Storage

–File-oriented access
–Multiple Clients, Shared Access to Data

•SAN – Storage Area Network
–Block-oriented access
–Single Server, Exclusive Access to Data

NAS: Network Attached Storage

•File Objects and Filesystems

–OS Dependent
–OS Access & Authentication

•Possible Multiple Writers
–Require locking protocols

•Network Protocol: i.e., IP

•“Front-end” Network