| 词条 | Direct-attached storage |
| 释义 |
Direct-attached storage (DAS) is digital storage directly attached to the computer accessing it, as opposed to storage accessed over a computer network (i.e. network-attached storage). Examples of DAS include hard drives, solid-state drives, optical disc drives, and storage on external drives. The name "DAS" is a retronym to contrast with storage area network (SAN) and network-attached storage (NAS). FeaturesA typical DAS system is made of a data storage device (for example enclosures holding a number of hard disk drives) connected directly to a computer through a host bus adapter (HBA). Between those two points there is no network device (like hub, switch, or router), and this is the main characteristic of DAS. The main protocols used for DAS connections are ATA, SATA, eSATA,[1] NVMe, SCSI, SAS, USB, USB 3.0, IEEE 1394 and Fibre Channel. Storage features common to SAN, DAS and NASMost 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). Advantages and disadvantagesThe key difference between DAS and NAS is that DAS storage is only directly accessible from the host to which the DAS is attached. A DAS does not incorporate any network hardware and related operating environment to provide a facility to share storage resources independently. The storage presented by a DAS to a connected host can of course be shared by that host. A SAN (storage area network) has more in common with a DAS than a NAS with the key difference being that DAS is a 1:1 relationship between storage and host whereas SAN is many to many. See also
References1. ^ {{webarchive |url=https://web.archive.org/web/20090515204633/http://www.serialata.org/technology/esata.asp |date=May 15, 2009 }} Englander, I. (2014). The architecture of computer hardware, systems software, & networking: An information technology approach (5th ed.). Retrieved from https://online.vitalsource. com/#/books/9781118803127 1 : Computer data storage |
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