📅 最后修改于: 2020-11-10 06:09:53 🧑 作者: Mango
SAN是存储区域网络的缩写。存储区域网络是专用的，专用的高速网络，可提供块级数据存储。它将存储设备的共享池交付给多台服务器。
SAN的主要目的是在服务器和存储设备之间传输数据。它还允许在存储系统之间传输数据。
存储区域网络主要用于从服务器访问存储设备，例如磁带库和基于磁盘的设备。
这是一个专用网络，无法通过LAN访问。它由主机，交换机和存储设备组成，这些主机，交换机和存储设备使用拓扑，协议和技术进行互连。
以下是SAN(存储区域网络)的最常见协议：
它是存储区域网络最常用的协议。它是光纤通道(FC)网络上SCSI命令的映射。
它代表Internet SCSI或Internet小型计算机系统接口。它是第二大块或SAN协议。它将SCSI命令放在以太网帧中，然后通过Internet协议(IP)以太网传输它们。
FCoE代表“ Internet光纤通道”。它是与iSCSI类似的协议。它将光纤通道放入以太网数据报中，然后通过IP以太网进行传输。
NVMe代表非易失性内存Express。它也是SAN的协议，可通过PCI Express总线访问闪存。
下表描述了存储区域网络和网络附加存储之间的区别：
| SAN | NAS |
|---|---|
| 1. SAN stands for Storage Area Network. | 1. NAS is an abbreviation of Network Attached Storage. |
| 2. It uses the fibre channel for connecting the several data storage devices. | 2. It is a hardware device which attaches to LAN through an ethernet connection. |
| 3. It is used in enterprise and professional environments. | 3. It is typically used in homes. |
| 4. It needs more administration for managing. | 4. It is managed easily. |
| 5. In this, data is identified by the disk block. | 5. In NAS (Network Attached Storage), both file name and byte offset are used for identifying the data. |
| 6. Storage Area Network is more complex than the Network Attached Storage. | 6. Network Attached Storage is less complex than the Storage Area Network. |
| 7. It is more costly than the Network Attached Storage. | 7. Its cost is less than the SAN. |
| 8. It depends on the Local Area Network and requires the TCP/IP network. | 8. It does not depend on the Local Area Network but uses the high-speed fibre channel network. |
| 9. ISCSI, FCoE, FCP, and Fc-NVMe are the protocols used in SAN. | 9. AFP, NFS, and SMB are the protocols used in NAS. |
| 10. In SAN, block by block technique is used for backup and recovery. | 10. Files in NAS are used for backup and recovery. |
| 11. It works easily with the virtualization technique. | 11. NAS is a file storage device that does not work with the virtualization technique. |
| 12. The file system is managed and controlled by the servers in SAN. | 12. The file system is managed by the head unit in NAS. |
下表描述了直连存储(DAS)和存储区域网络(SAN)之间的区别：
| SAN | DAS |
|---|---|
| 1. SAN is a short form of Storage Area Network. | 1. DAS is a short form of Direct Attached Storage. |
| 2. It uses block by block copying technique 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. Storage Area Network is slightly difficult to install and 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 SAN. |
| 6. The capacity of SAN is more than the 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 Internet Protocol and Fibre Channel for transmission of data. | 8. It uses IDE/SCSI for the transmission of data. |
以下是存储区域网络(SAN)的优点或好处：