The whole regard of hardware, system software, middleware, application is required on the realization of high availability, so that speedy restoration and the data consistency are assured in case of any segment invalidation.

• 高可用性的实现需要在硬件、系统软件、中间件、应用软件上的整体考虑，以保证系统在任一环节失效的情况下，都能进行及时恢复，要求系统恢复时间极短，并且在系统恢复后保证数据的一致性。