SAN(Storage Area Network) and NAS (Network Attached Storage)are differentiated by the protocols that is used to communicate between two or more devices.
Data Transport Protocol:
SAN uses SCSI protocol to transfer data to communicate between devices and often it uses FCP,iSCSI,FoE. The SAN storage device presents RAID volumes as block storage and hosts format their own filesystem on their assigned volume.
NAS is accessed using file server protocols such as NFS/CIFS/HTTP/FTP protocols to transfer data through the network. The NAS storage device mounts a filesystem formatted on its internal RAID volume and exports the storage as directories and folders.
NAS is accessed using file server protocols such as NFS/CIFS/HTTP/FTP protocols to transfer data through the network. The NAS storage device mounts a filesystem formatted on its internal RAID volume and exports the storage as directories and folders.
SAN does block-level I/O and NAS does file-level I/O to the storage. SAN addresses the data by logical block numbers, and transfers the data in (raw) disk blocks whereas NAS identifies the data by file name and byte offset, transfers file data or metadata, and handles security, user authentication, file locking etc. When a server is accessing NAS storage it will see as a share(when mapped) & if a server is accessing SAN storage it will show up as an actual drive.
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