Compensation method for fc network clock synchronization error

Abstract

The invention relates to a clock synchronization error compensation method of an FC network. The method comprises the following steps: a client side receives a CSU ELS frame or a clock synchronization primitive signal sent by a server; according to the CSU ELS frame or the clock synchronization primitive signal, whether a clock synchronization counter of the client side is consistent with a clock synchronization counter of the server or not is judged; the theoretic difference value between the clock synchronization counter of the client side and the clock synchronization counter of the server is acquired, and compensation control is conducted on counting operation of the clock synchronization counter of the client side according to the theoretic difference value; after the compensation control is completed, whether the clock synchronization counter of the client side is consistent with the clock synchronization counter of the server is judged again. The clock synchronization error compensation method has the advantages that a wide range of jumping or returning generated by a clock of the client side in a direct clock synchronization process can be avoided; the compensation accuracy is high.

Description

technical field [0001] The invention belongs to the technical field of computer communication and relates to a compensation method for FC (Fibre Channel) network clock synchronization error. Background technique [0002] The FC network has the characteristics of high bandwidth, low delay and high reliability, and is very suitable for use in distributed systems that have high requirements for real-time data transmission. Clock synchronization technology is a classic problem in distributed systems, distributed in different hosts When the applications in the system coordinate with each other and complete a task together, they need an accurate and unified clock among these systems. [0003] The FC network supports the clock synchronization function, which allows time-sensitive information to be exchanged between different nodes in the network. The clock synchronization service of the FC network is obtained through the clock synchronization server containing the reference clock....

AI Technical Summary

Problems solved by technology

[0004] During the clock synchronization cycle (the time interval between two clock synchronization messages sent by the server), due to the difference in crystal oscillator frequency between the server and the client, there will be a large deviation in the respective clock synchronization counter values ​​of the server and the client. The server's clock synchronization information directly updates its own clock synchronization counter, which may cause the client's clock to jump forward or backward in a large range, resulting in non-monotonic changes in the clock and increasing the upper-layer software's application of time information. Complexity, reducing the versatility of the clock synchronization function

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