Cluster Operating System Availability Management

The advantage of cluster system is scalability. But with the number of cluster increasing, the whole dependability of cluster will decrease. So, the high availability software will be an inevitable part of cluster operating system. The recovery method is especially important to the application that is large scale and will run long time. On the other hand, that every subsystem or sub service take care of them high availability in cluster operating system is complex and will result in the waster of resource of system and labor in the development and run process. So the independent management software is needed to maintain the high availability of subsystem.The "Dawning 4000" cluster operating system is an integrated middleware system. HA triger belongs to it and is called a service. Being taken out from the past cluster system software, this service can be shared by different system components.. HA triger is useful for managing the high availability of applications and services which are small scalar. The author adopts the idea of service-based design and component-based development to design the HA triger and to implement it with CORBA. The HA triger has the characteristic of high availability, scalability, compatibility and so on.The purpose of this paper is to increasing the service availability in cluster system. And the project context is the Dawning 4000 cluster operation system. It discussed the key problem and the methord that solve it in the designing and development of high availability software service management software of cluster operating systems.In the beginning, this paper introduces its background,the purpose of researching and high availability basic theory. Then it describes the high availability designing of Dawning 4000 operating system and put forwards the key problem of high availability admistration in cluster operating system. Furthermore, we designed HA trigger architecture surrouding these problem. At last, we used the math model to analyze the effect of service availability that HA trigger brought forth quantitatively.