Different tape sub-systems are targeted at specific use cases. Large format tapes and ATLs are good for backing up data, but are not conducive for quick access to individual objects. Virtual tape servers, because of limited disk cache, are not well suited for backup because of the potential of overrunning cache and causing thrashing. As a result it is quite common to find multiple tape sub-systems on the floor to address the different needs.
A Virtual Tape Library with a mix of deduplication and primary storage can support all mainframe use cases. Deduplication significantly reduces the storage capacity required for backup data and minimizes transmission costs of data vaulting. Primary storage provides fast and predictable access to random pieces of. With this mix of storage types, all tape processing needs can be satisfied by a single solution and save money by reducing support, maintenance and personnel costs. Discussion points include:
How different disk technologies address different needs
How to reduce costs with virtualization
Enhanced data protection