SAN or NAS storage systems… How do they affect my applications?

Here are some salient difference I gathered:

	SAN	NAS
Connection	FC/ SCSI	Ethernet
Speed	Typically faster (unless over Ethernet like FCoE or iSCSI)	Typically slower
Cost	Typically higher	Typically lower
Intrusiveness	Appears like locally attached storage to OS	Remotely accessible filesystem using protocols like: NFS (Unix)/ CIFS (Windows)/ AFP (iOS) or even HTTP
Can same unit be shared across different servers?	No – every server mount will have its own exclusive blocks	Yes. Concurrent access and locking is handled by the access protocols
Unit of storage	block-level	file-level