1 network storage technology
1. 1 Overview
Network storage realizes data transmission based on standard network protocols, so that other devices in the network can read and back up data. Network storage technologies include direct attached storage (CDAS), network attached storage (CNAS) and storage area network (CSAN). In the campus network, we mainly apply the storage area network with better security and higher stability.
1.2 storage area network
The storage area network takes Fibre Channel as the medium, and the whole storage system and server are independent of each other. Upgrading and maintaining the storage system will not affect the normal operation of the server. In this way, the security and scalability are effectively guaranteed, and the use of Fibre Channel greatly improves the efficiency of data transmission.
In a storage area network, centralized management of network devices and data can allocate storage space for network services at any time, and data security can be guaranteed through the technology of "redundant array of independent disks".
1.3 Fibre Channel
Fibre Channel is a layered high-speed communication protocol, which includes five layers: physical layer, codec layer, frame relay/flow control layer, general service layer and upper layer protocol layer. It supports the data rate of 1- 10 Gbp and can ensure the efficient transmission of data information in storage area networks.
1.4 redundant array of independent disks (CRAID)
RAID technology can combine multiple independent disks into a logical hard disk in different ways, which can improve the storage performance and redundancy of storage devices. After continuous development, RAID has seven RADI levels from 0 to 6. Among them, RAID 0 is a non-redundant and non-checking disk array, which is the fastest to read and write, but the security is not high; RAID 1 is a mirrored disk array, and 1 is the safest for mirrored backup of 1'.
In the storage of campus network, RAID 5 0RAID 5, which is the most efficient, is usually adopted, taking into account the storage performance, data security and storage cost, and the reading and writing speed is similar to RAID 0. RAID 5 consists of multiple pieces of data corresponding to one parity information, which may cause physical disk failure. Compared with RAID 1, it greatly improves the disk utilization.
2. Building campus network storage
2. 1 necessity
Universities usually centrally operate and maintain a large number of application systems: mail system, database server, OA server, online teaching platform, online examination platform, etc. By constructing network storage, storage utilization can be improved, hardware cost can be reduced, management and maintenance can be simplified, and centralized data backup can be realized.
2.2 Building a storage area network
Deploy four terminal storage systems with 8Gbp and Fibre Channel interfaces, and configure 16 6006 lOK high-speed disks and 16 3TB7.2K large-capacity disks.
Configure the terminal storage system with dual storage controllers that support hot plugging. In this way, you can expand the disk capacity or replace the disk without interrupting the business. The two controllers are mutually hot standby and seamlessly connected. When one controller fails, another controller can take over the business of the failed controller. After the fault is repaired, you can automatically switch back to the original service.
Deploy a data switch equipped with 10gb module, connect this switch to the network of application service system, and connect the switch with the storage system through the Fibre Channel interface on the storage server. Through configuration, the required storage application service system and storage system form a channel.
2.3 Related servers using network storage methods
Create a corresponding logical unit number (CLUN) on the storage controller for application services that need to be connected to storage, and divide a reasonable storage space for this logical unit number. On the application server, find the target through initiator addressing, associate the corresponding logical unit number and establish the connection. The network disk can be found by looking for new hardware, and can be used as a local disk after formatting.
3 Conclusion
A series of advanced technologies such as Internet of Things, cloud storage and big data are all inseparable from data. Data is undoubtedly the core of the future campus network. Network storage technology supports the safe and stable storage or transmission of data. Making good use of network storage technology can not only provide stable and safe services for the existing network information resources, teaching and scientific research platforms, but also reserve necessary technical support for the future information technology research and development of the school.
;