📅 最后修改于: 2020-11-10 06:07:01 🧑 作者: Mango
网络附加存储(俗称NAS)是一种连接到网络的文件存储设备，使多个用户可以从集中式磁盘容量访问数据。 LAN上的用户通过以太网连接访问共享存储。
这种存储是快速，低成本的，并提供了站点上公共云的所有优势。它使用文件访问协议，例如NFS，SMB，NCP或AFP。
NFS是一种基于文件的协议，在Unix系统上很流行。 SMB代表服务器消息块，它与Microsoft Windows系统一起使用。 AFP也是Apple计算机使用的文件访问协议。
它基本上是为那些每分钟可能处理数百万次操作的网络系统设计的。它为需要可靠网络系统的组织支持存储设备。它比文件服务器更经济，比外部磁盘更通用。
下表描述了存储区域网络(SAN)和网络附加存储(NAS)之间的区别：
| NAS | SAN |
|---|---|
| 1. NAS is an abbreviation of Network Attached Storage. | 1. SAN stands for Storage Area Network. |
| 2. It is a hardware device that connects to LAN through an ethernet connection. | 2. It uses the fibre channel for connecting the several data storage devices. |
| 3. It is typically used in homes. | 3. It is used in enterprise and professional environments. |
| 4. It is managed easily. | 4. It needs more administration for managing. |
| 5. In NAS (Network Attached Storage), both file name and byte offset are used for identifying the data. | 5. In this, data is identified by the disk block. |
| 6. Network Attached Storage is less complex than the Storage Area Network. | 6. Storage Area Network is more complex than the Network Attached Storage. |
| 7. Its cost is less than the SAN. | 7. It is more costly than the Network Attached Storage. |
| 8. It does not depend on the Local Area Network but uses the high-speed fibre channel network. | 8. It depends on the Local Area Network and requires the TCP/IP network. |
| 9. AFP, NFS, and SMB are the protocols used in NAS. | 9. ISCSI, FCoE, and SATA are the protocols used in SAN. |
| 10. Files in NAS are used for backup and recovery. | 10. In SAN, block by block technique is used for backup and recovery. |
| 11. NAS is a file storage device that does not work with the virtualization technique. | 11. It works easily with the virtualization technique. |
| 12. The file system is controlled and managed by the head unit in NAS. | 12. The file system is managed and controlled by the servers in SAN. |
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 for sharing the files on different OS. | 7. This storage device does not allow users for sharing the files on different OS. |
| 8. It uses Ethernet and TCP/IP for the transmission of data. | 8. It uses IDE/SCSI for the transmission of data. |
以下是网络附加存储(NAS)的优点或好处：
以下是网络附加存储(NAS)的缺点或局限性：