Virtual Disks and Fault Tolerant Paths in Windows

A redundant path driver for Windows is implemented to tolerate the path failures and improve the system availability.Virtual bus device objects and disk device objects are registered and kept persistently even when the path fails,to prevent the upper applications from being interrupted.The bus device driver and disk filter driver is integrated to simplify the implementation and save the consumed kernel spaces.Through the introduction of virtual disks,the device persistency is achieved in the plug and play environment,and the storage hierarchical device tree is not changed.