Esc Protocol And Data Maintenance Module Analysis And Implementation In Vsan System

SAN (Storage Area Network called SAN) is independent of the high-speed fiber optic network storage network other than the server network system,This network uses high-speed Fibre Channel as the transport body, To FC protocol for storage access protocol. SAN system is realy high-speed shared storage.But the SAN network has some shortcomings,Equipment costs are high, There are a Large number of switches and network cards and the cable,A lot of investment and maintenance in equipment,And the relatively poor scalability.To solve these problems, Emergence of virtual SAN (VSAN) network. VSAN can be divided into multiple separate SAN network. Using VSAN, Data traffic can be isolated in a storage area network. If one VSAN fails, Its impact will be limited in this VSAN, Will not spread to other VSAN. VSAN can be flexible, economical, efficient and manageable way to further expand and protect the SAN. VSAN overcome many of the deficiencies and shortcomings of SAN network, Implementation storage integrity with VSAN.This paper analyzes an important part of the VSAN network———Some links consultations. Link negotiation is Necessary negotiation of link layer after the success of each switch connected, Only link negotiation is successful, Terminal can smoothly access and store data. This article focuses on the link consultations in ESC (Exchange Switch Capabilities ability to interact with the switch) protocol negotiation. Introduction ESC protocol that include the content of ESC protocol, format, consultation process and other related knowledge. ESC protocol negotiation is exchange between the vendor and protocol information of a mechanism among switchs.The paper introduced the port weather Support ability of VSAN through consultation to the ESC protocol.And also gives the interface of ESC consultation process,Data structure and other related information. In addition this article also describes the implementation process and data structure of the data link maintenance module. After successful link negotiation, Ports and VSAN to have a certain relationship. The relationship is managed by the data link maintenance module, For example, The module stores VSAN ID that belong to which port.