Storage Features Common To SAN, DAS and NAS
Most functions found in modern storage do not depend on whether the storage is attached directly to servers (DAS), or via a network (SAN and NAS).
A DAS device can be shared between multiple computers, as long as it provides multiple interfaces (ports) that allow concurrent and direct access. This way it can be used in computer clusters. In fact, most SAN-attachable storage devices or NAS devices can be easily used as DAS devices – all that is needed is to disconnect their ports from the data network and connect one or more ports directly to a computer (with a plain one-to-one cable).
More advanced DAS devices, like SAN and NAS, can offer fault-tolerant design in many areas: controller redundancy, cooling redundancy, and storage fault tolerance patterns known as RAID. Some DAS systems provide embedded disk array controllers to offload RAID processing from the server's host bus adaptor (HBA). Basic DAS devices do not have such features.
A DAS can, like SAN or NAS, enable storage capacity extension, while keeping high data bandwidth and access rate.
Read more about this topic: Direct-attached Storage
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