There are four professional network storage technologies used for network storage of information, including DAS, NAS, SAN, and iscsl. They can use RAID arrays to provide efficient and safe storage space.
1. Direct Attached Storage (DAS).:Direct attached storage refers to connecting storage devices directly to a server through SCSI interface. DAS has low acquisition cost, simple configuration, and the use process is not much different from the use of the local hard disk. The requirement for the server is only an external SCSI port, so it is very attractive for small enterprises.
2. Network Attached Storage (NAS): NAS is actually a storage device with thin servers. This thin server is actually a network file server. The NAS device is directly connected to the TCP/IP network, and the network server accesses the management data through the TCP/IP network.
3. Storage Area Network (SAN): SAN is actually a special network built for storage and independent of TCP/IP network. The general SAN provides the transmission rate of 2Gb/S to 4Gb/S. At the same time, the SAN network is independent of the data network, so the access speed is very fast. In addition, the SAN generally uses high-end RAID arrays, making the performance of the SAN superior to other professional network storage technologies.
4．iSCSI: The cost of using a dedicated storage area network is high, while using a common data network to transmit SCSI data to achieve functions similar to SAN can greatly reduce the cost and improve the flexibility of the system. ISCSI is such a technology. It uses the common TCP/IP network to transmit the SCSI data blocks that were originally transmitted by the storage area network.
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