Storage Subsystems
Up to this point, the discussions in Part III of this book have been on the disk drive as an individual storage device and how it is directly connected to a host system. This direct attach storage (DAS) paradigm dates back to the early days of mainframe computing, when disk drives were located close to the CPU and cabled directly to the computer system via some control circuits. This simple model of disk drive usage and configuration remained unchanged through the introduction of, first, the mini computers and then the personal computers. Indeed, even today the majority of disk drives shipped in the industry are targeted for systems having such a configuration.
However, this simplistic view of the relationship between ...
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