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

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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

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