What is DAS?

Direct attached storage is the term used to differentiate non-networked storage from SAN and NAS. In direct attached storage, the hardware is connected to an individual server. There may be more than one server but storage for each server is managed separately and cannot be shared,

The main protocols used in DAS are ATA, SATA, SCSI, SAS, and Fibre Channel. Traditionally, a DAS system enables storage capacity extension for a server, while keeping high data bandwidth and access rate. A typical DAS system is made of one or more enclosures holding storage devices such as hard disk drives, and one or more controllers. The interface with the server or the workstation is made through a host bus adapter (HBA).