📅 最后修改于: 2020-11-10 06:02:11 🧑 作者: Mango
DAS代表直接附加存储。它是通过电缆直接连接到服务器，工作站或个人计算机的数字存储设备。在Direct Attached Storage中，应用程序使用块级访问协议来访问数据。
无需任何网络即可将设备连接到服务器或工作站。因此，DAS(直接附加存储)不是存储网络的一部分。该存储设备的一些示例是固态驱动器，硬盘驱动器，磁带库和光盘驱动器。
DAS系统通过HBA(主机总线适配器)直接连接到计算机。与NAS设备相比，它的设备直接连接到服务器而不需要网络。此存储设备的现代系统包括磁盘阵列的集成控制器。具有高级功能。
对于那些不想在企业之间共享数据的小型企业，工作组和部门来说，这是一个不错的选择。它用于需要较少主机和服务器数量的地方。
以下是两种类型的直接附加存储(DAS)：
内部DAS是DAS，其中存储设备通过HBA在内部连接到服务器或PC。在此DAS中，HBA用于短距离的高速总线连接。
外部DAS是DAS，其中外部存储设备直接连接到服务器而没有任何设备。在这种类型的DAS中，FCP和SCSI是充当服务器和存储设备之间接口的协议。
下表描述了直接附加存储(DAS)和网络附加存储(NAS)之间的区别：
| NAS | DAS |
|---|---|
| 1. NAS is a short form of Network Attached Storage. | 1. DAS is a short form of Direct Attached Storage. |
| 2. It uses files for backup and recovery. | 2. It uses sectors for backup and recovery. |
| 3. This storage Device is complex than the DAS device. | 3. This storage device is simple, not complex. |
| 4. Network Attached Storage is slightly difficult to set up. | 4. Direct attached Storage is easy to set up and install. |
| 5. The cost of this storage device is higher than the DAS device. | 5. Its cost is low as compared to NAS. |
| 6. The capacity of NAS is 109 to 1012 bytes. | 7. The capacity of DAS is only 109 bytes. |
| 7. This storage device allows users to share the files on different OS. | 7. This storage device does not allow users to share the files on different OS. |
| 8. It uses Ethernet and TCP/IP for transmission of data. | 8. It uses IDE/SCSI for the transmission of data. |
下表描述了直连存储(DAS)和存储区域网络(SAN)之间的区别：
| DAS | SAN |
|---|---|
| 1. DAS is a short form of Direct Attached Storage. | 1. SAN is a short form of Storage Area Network. |
| 2. It uses sectors for backup and recovery. | 2. It uses block by block copying technique for backup and recovery. |
| 3. This storage device is simple, not complex. | 3. This storage Device is complex than the DAS device. |
| 4. Direct attached Storage is easy to set up and install. | 4. Storage Area Network is slightly difficult to install and set up. |
| 5. Its cost is low as compared to SAN. | 5. The cost of this storage device is higher than the DAS device. |
| 7. The capacity of DAS is only 109 bytes. | 6. The capacity of SAN is more than the 1012 bytes. |
| 7. This storage device does not allow users to share the files on different OS. | 7. This storage device allows users to share the files on different OS. |
| 8. It uses IDE/SCSI for the transmission of data. | 8. It uses Internet Protocol and Fibre Channel for transmission of data. |