Patent ID: 8069364
Filing Date: 2011-11-29
Classification: G06F

Abstract:
1. A method for recovering from a logical failure comprising: detecting by a host a logical path failure of a first logical path in a storage control unit; entering a path discovery mode of operation upon detection of the logical path failure; performing a logical path recovery operation, the logical path recovery operation comprising: removing the logical path from a group of available logical paths and performing an establish a logical path operation after removing the logical path from the group of available logical paths; moving the logical path from the working path group logical mask to an intermediate failure mask upon detection of the logical path failure of a logical path identified within the working path group logical mask, the logical path remaining in the intermediate logical path mask until and unless it is determined that additional logical paths are desired; selecting another logical path to continue operation; determining a need for additional logical paths; performing logical path discovery for each of the logical paths in the intermediate mask; moving a logical path from the intermediate mask to the working mask wherein the host need not perform a path disband and path group reestablishment operation.