High-reliability system device and method combining virtual machine fault-tolerant technique and high-availability cluster technique

The invention provides a high-reliability system and method combining the virtual machine fault-tolerant technique and the high-availability cluster technique, which belong to the technical field of computers and communication and are particularly suitable for guaranteeing the continuity and reliability of user business. The conventional high-availability cluster technique can cause interruption of business during business switching, and the interruption is intolerable for key business; since the memory information of a host is synchronized to a backup host in real time based on the online migration virtual machine fault-tolerant technique of a virtual machine, under the circumstance of the system abnormality of the host and the operation abnormality of the business, such abnormality information is also synchronized to the backup host, and as a result, even if the backup host can take over the host, the reliability of the business cannot be ensured since both the abnormality information of the system and the abnormality information of the business are reflected on the backup host at the same time. By combining the virtual machine fault-tolerant technique and the high-availability cluster technique, not only is the problem that the business is suspended during switching time in the high-availability cluster technique solved, but also the problem that the system and the business are still abnormal after the backup host takes over the host under the circumstance of the system abnormality of the host and the abnormality of the business is solved. Thereby the continuity and reliability of the user business are guaranteed effectively.