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Deploying iscsi storage Solutions on Microsoft Windows Server Platform
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| bet | 8/77 | | Sana | 21.03.2017 | | Hajmi | 12,28 Mb. | | #434 |
Direct-Attached Storage (DAS)
DAS is probably the most well-known form of computer storage. In a DAS implementation, the host computer has a private and usually exclusive channel between the host CPU and the storage device or devices, so that the host “owns” the storage. In this context, DAS storage has also been called “server-centric” or “silo” storage. Everything from personal computers to mainframe computers have used this implementation. Over the years, various interfaces have been used for this purpose, including IDE/ATA and SCSI. The advantage of DAS is that it is relatively simple to understand and implement. The disadvantages are that there is limitation to the number of devices that can be connected on the same interface, a relatively short distance between the host CPU and the storage device(s) due to cable length restrictions, and when larger storage devices are required the data must often be moved from the smaller device to the larger device, potentially consuming a large amount of time. In addition, many DAS storage architectures require that the host computer be taken offline when adding or removing storage devices. The DAS model doesn’t scale to large or distant environments very well. A server in this model doesn’t directly share its storage resources.
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