Linux Dual Hot Backup Design And Realization

This thesis discuss some primary technology of real time backup which is include RAID, SFT, and some commercial software, for instance, LifeKeeper, Octopus based on NT and Sentinel based on SCO UNIX. This thesis put forward an ideal (EverGreen) and detail expresses how to realize it. In fact the EverGreen only a server provide services, when it have in trouble, these services and some protected resources switch to another server. These protected resources include hard disk (or partition), II?address, name of server, application software (Options). EverGreen uses ICMP packet to detect whether the other side is alive. Thesis anatomizes the trace of LINUX system call, and determines a method to interrupt and capture the system call of write. EverGreen through scans and modifies the queue of Request, which include device number, block number, writing data, and so on. Finally give out a frame of Real Time Backup system. The kernel include interruption and capture the system call of write and getting, storing these writing data, the Real Time Backup system's management. In the user level include detecting and exchanging Real Time Backup system's status, recording the log message, user operating console, and transporting the writing data to other side.