Shype to maintain the ATM system stability

Large applications executing on Grid or cluster architectures consisting of hundreds or thousands of computational Nodes create problems with respect to reliability. The ATM Machine is one of such Application. There is an increasing need for fault tolerance capabilities in logic devices brought about by the scaling of transistors to ever smaller geometrics. This paper presents a secure hypervisor (Shype) based replication approach, Virtual lock step and Processor state finger printing that can be applied to Fault tolerance server to maintain stable execution. These are transparent protocols capable of overcoming problems associated with both, benign faults, i.e., crash faults, and node or subnet volatility. A novel form of processor state fingerprinting can significantly reduce the fault detection latency. This further improves reliability by triggering rollback recovery using Virtual locks when errors are recorded. HyperShield, which is a hypervisor that can be inserted into and removed from a running operating system, for improving security. The low-cost protocols offer the capability of controlling or bounding the overhead. A formal cost model is presented, followed by an experimental evaluation. It is shown that the overhead of the protocol is very small and the Maximum work lost by a crashed process is small and bounded.