Patent ID: 7797577

Claim:
A system, comprising: a first processing system; a second processing system; hosts in communication with the first and second processing systems; a first computer readable medium including first code executed by the first processing system to perform detecting a failure of the second processing system; determining at least one device group of storage devices managed by the failed second processing system; determining for each determined device group hosts that connect to storage devices in the device group; sending for each determined device group, a unit check to each determined host indicating failure of the device group through one storage device in the device group to which the determined host connects; a host computer readable medium including second code executed by the determined hosts to perform executing instructions for each received unit check to terminate any I/O operations in progress on the storage devices in the device group indicated in the received unit check; and issuing a command to one storage device in each device group for which the unit check was received to end a busy condition for the issuing host.