Nowadays as the protection of data is important, so is the continuity of accessibility to that data.
Traditional storage units are briefly accessed via the protocols below.
DAS (Direct Attached Storage)
Storage units directly connect to the server with a fiber, SAS cable. This method is inexpensive and has a high performance but its scalability and management are limited.
NAS (Network Attached Storage)
Storage units connect to clients and servers through network protocols. This is the most commonly used method among business. It's relatively inexpensive and has an acceptable performance.
SAN (Storage Area Networks)
Storage units connect to servers via SCSI protocols. They communicate via FC, FCOE, iSCSI protocols through fiber or copper cables, according to needs. Infrastructure costs are higher when compared to NAS and DAS. Has an improved performance and features scalability and management.