Patent Number: 8,819,317

Title: Processing input/output requests using proxy and owner storage systems

Abstract: Methods, apparatus and computer program products implement embodiments of the present invention that include configuring a first storage system as a proxy for a logical volume stored on a second storage system. The first computer system receives an I/O request from a host computer for the logical volume, the host computer, and identifies a port on the second storage system for the I/O request. In some embodiments, the second storage system has multiple SCSI ports, and the identified port comprises a least busy SCSI port. A probe request verifying availability of the logical volume is conveyed to the identified port, and upon receiving a response from the second storage system verifying the availability of the logical volume for the I/O request, the I/O request is conveyed to the identified port, a result of the I/O request is received from the identified port, the result is conveyed to the host computer.

Inventors: Li-On; Oren (Ramat-Gan, IL), Nissan-Messing; Orit (Hod HaSharon, IL), Perek; Eyal (Petach Tikva, IL)

Assignee: International Business Machines Corporation

International Classification: G06F 3/06 (20060101); G06F 13/00 (20060101)

Expiration Date: 8/26/12018