A system that manages the network functions and carries the data traffic from host to storage.

A system that handles the interconnection of hosts to disks drives and allows hosts to directly access the disks and use it as local drives.

A system that has the management software that can provide access to its sets of hard drives or tape libraries for the purpose of data access and storage.

A system that handles the communication of data from end users to its storage location and provide confirmation on successful storage.