There are three major categories of storage systems: DAS, NAS, and SAN. These terms describe the method by which server hosts are attached to and access storage devices. We will describe each type in the following sections. These storage types and the interconnects that can be used with them are not independent of each other, and they can be integrated in various ways, as you will see in the following sections.
DAS stands for direct attached storage. This means that a server is directly connected physically to a storage device. That storage device can be either internal or external disk storage. This is the most basic and most widely used type of storage. The physical interconnect runs directly from the server to the storage ...