College】 【weak of network storage technology.

<br> <BR> Abstract: With the growth of Storage Area Network SAN, there is a growing concern about how the network based on IP technology to reduce network traffic caused by storage. .Therefore, IP storage technology began to appear, the paper describes both the IP-based files and data storage, and the difference between block storage, and described the factors promoting the development of IP storage, the design of technology, and whether the widespread adoption of the technology-specific conditions and .provides several storage policy can draw. .<BR> Keywords: IP Storage SAN Fibre Channel block-level storage TCP / IPFCIPiSCSIiFCPFCIP structure IPSAN <BR> 1IP introduced <BR> IP storage technology involves a series of technology that can make block-level data stored in the IP-based network .Road in the transmission, and there are two technologies need to clarify: IP technology and the use of block-level storage. .Block-level storage network, data transmission is not new technology, today's storage area network SAN is Fibre Channel FC even with technology industry is still the case. .However, the new IP SAN storage protocol can be multiple IP such as Ethernet through the structure established, and fully connected. .Common Internet File System CIFS and NFS network file system file-level request is sent to the server with the file system, these requests are those file servers or network storage NAS device response, and sent to the host on the network. .<BR> 2IP network storage to accommodate growing demand for <BR> Today, IP has become a strong and important common network protocol, IP Storage naturally become the most able to adapt to the growing needs of network storage technology. .<BR> 2.1 growing network storage IDC International Data Association, is expected after 2008, the storage capacity will be 85% annual growth, this growth shows that: the growing importance of data, and storage resource management more difficult. .Therefore, all companies are committed to the development of network-based SAN storage system for storage, access, protection and management of critical business data. .Practical work on, IDC predicted that 2009, the world will achieve 92% of the storage network. .<BR> 2.2IP is already used in network protocols and other network protocols, within the global business-critical applications Fan Wei, IP has been more widely recognized, in the Ethernet environment, IP technology is also more economical .practical. .Benefit from the wide application of IP technology and its low price, a lot of information specialists are committed to IP technology, IP technologies making a wider and more solid foundation. .This system of IP quality of service, links, technical and security priorities to promote the rapid development of its technology and development continues to expand. .<BR> 2.3IP storage is the next stage of IP technology, IP technology in the early development, mostly IP architecture in all things, such as Ethernet, TokenRing, ATM, etc., and today's video, sound, and the block-level storage technology .were all based on IP transmission, and the formation of all structure in the IP on the situation. .<BR> 3IP stored <BR> current IETF standards process, the development of three IP storage compression protocol: iSCSI, TCP / IP-Fibre Channel FCIP and Internet Fibre Channel Protocol iFCP. .<BR> 3.1iSCSI transmit SCSI commands via IP will provide the necessary mapping of iSCSI, SCSI commands via IP transmission as today's fiber channel to transmit SCSI commands the same. .iSCSI is host to the storage device designed to end to end connection, similar to Fibre Channel SAN architecture, iSCSI allows the host to a compatible technology, including the storage devices to communicate through the IP switch. .The drive can still use real SCSI drive is not the same as iSCSI connectivity to today's hard disk. .<BR> 3.2FCIP Internet Fibre Channel SAN environment as iSCSI protocol to SCSI commands as compressed IP packets, FCIP protocol to Fibre Channel commands for the IP packet compression, FCIP protocol allows independent SAN environment, through IP networking together. .FC SAN using standard addressing each of the FCIP tunnel endpoint or gateway between the IP, once the tunnel establishment, expansion device FC FC will be treated as standard equipment, and to FC addressing. .A typical application is in a FCIP endpoint connecting two or more IP network architecture over the standard FC switch, through the internal exchange of links with the previous combination of SAN fiber loop. .<BR> 3.3IFCP with different addressing modes in the latest IP storage protocol, iFCP range between the two protocols described above, the same as FCIP, iFCP the FC frame compression, using a common compression format FC, through the IP architecture .transmission, with the main difference between the first two protocols in the addressing mode. .FCIP SAN agreement is between the two build-to-point Ethernet tunnels to form a unified SAN environment. .Correspondingly, the iFCP between the FC and IP gateway to gateway connections are FC frame can be routed to the correct destination address. .With the FCIP protocol is currently addressing the iFCP different addressing modes is that it allows each have a SAN interconnect separate namespace. .<BR> 4IP <BR> IP address stored in storage is an emerging technology, despite its standards have been established and applied, but its real widespread application to the storage environment also needs to address several key technical points. .<BR> 4.1TCP load idle because IP can not ensure the submission to each other, and the TCP as the underlying transport of the three IP storage protocols will need to be crowded, long-distance IP space to ensure transmission reliability, the IP packet can play .arbitrary order of transmission, therefore, TCP layer needs to amend the order, to be submitted to the upper layer protocols, such as SCSI. .A typical TCP operation in this task is to use re-adjust the order of the buffer, the order of the packet to the correct way to complete order to complete this operation is, TCP layer to send data to the next level. .Although the price performance ratio <BR> 4.2 IP technology is likely to be applied, but if performance is more valued, I do not recommend using standard Ethernet card. .As mentioned earlier, TOE can reduce server processing load, but because of relatively new TOE equipment, the hardware cost and complexity of the program higher than the standard card. .Because of its wide application may be hampered by high price performance ratio. .Enhanced iHBA like those need to be further improved, has reached the level of FC technology. .<BR> 4.3 security framework when the storage device through the IP for remote connection, security becomes more important. .Product manufacturers must clearly the security level, and to ensure their safety. .IP storage products are widely used in the earlier, the IETF to solve the problem. .<BR> 4.4 IP-based connectivity technology, and is not shared by all manufacturers, though this has long been the standard protocol published, but can not guarantee that manufacturers and manufacturers use the same protocol or technology. .In order to ensure that these products can complement each other better, must ensure that the same protocol used between manufacturers, so the manufacturers have good connectivity products. .<BR> 5IP Application Status <BR> IP storage storage solution will be adopted gradually, the technology may go through three stages of development. .<BR> 5.1 Stage One: SAN Extender With the development of SAN technology in the world, more and need long-distance SAN connectivity. .IP storage technology located in close connection to multiple devices, like a large enterprise data sharing among multiple sites, and remote data mirroring. .This technique is the use of FC to IP bridge or router, and the two remote SAN connectivity through the IP architecture, while iSCSI devices can achieve the above techniques, but the FCIP and iFCP are more suitable for such applications, because they used the .Fibre Channel Protocol FCP. .<BR> 5.2 Phase II: IP is stored in a limited area in the second phase of the development of IP storage mainly in small, low-cost products, there is no truly global SAN environment, followed by the technology is limited .region, based on the IP-SAN connectivity. .May appear similar to the NAS device can be installed on the iSCSI card and the demand for this technology can make up for TOE devices NAS technology solutions. .<BR> 5.3 Phase III: IPSAN. .Complete end to end, global IP-based SAN storage will be there, and the iSCSI protocol is the most suitable. .ISCSI-based IPSAN will iSCSIHBA composition, it can release a large number of TCP load, to ensure that the local iSCSI storage devices can be free in the IP communications architecture, once the realization that some IP's advanced features, such as bandwidth collections, quality service assurance and so may .applied to the SAN environment. .<BR> IP SAN performance storage network can be expanded. .Combination of the IP network can be extended to the storage network SAN, the current FC technology to build the broad, global IP technology, like Ethernet and ATM same. .Whether in remote FCSAN Internet, or create complete end to end IPSAN, based on iSCSI, iFCP and FCIP's IP storage technology will be applied in the near future in the storage vendor's storage products. .<BR> <BR> <BR> <BR> <BR>.