Patent ID: 9274916
Filing Date: 2016-03-01
CPC Classification: G06F

Claim Text:
1. An owner storage system, comprising: a storage device configured to store a logical volume mapped between a host computer and a computer having multiple initiator ports; and a processor configured: to detect a unit attention condition for the logical volume, to generate a unit attention code and a respective unique serial number in response to detecting the unit attention condition, upon receiving an input/output (I/O) request for the logical volume from a given initiator port, to convey, to the given initiator port, the unit attention code and the respective unique serial number in response to the I/O request, and upon determining, based on the unique serial number, that the processor has previously conveyed the unit attention code to any of the multiple initiator ports, to reconvey the I/O request, receive a response for the I/O request, and convey the result to the host computer.