Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
2006-08-01
2006-08-01
Vital, Pierre (Department: 2188)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
Reexamination Certificate
active
07085883
ABSTRACT:
Method and apparatus for migrating a volume and a virtual disk from a first storage controller to a second storage controller in a distributed storage system having volumes and virtual disks associated with storage controllers. In one embodiment, the virtual disk is migrated to the second storage controller, and requests for data reads/writes associated with the virtual disk are routed to the second controller. Further, in another embodiment, the volume is migrated to the second storage controller, and requests for data reads/writes associated with the volume are routed to the second controller. A contact address may be associated with a plurality of storage controllers and once a session between an application server and a volume is established, the application server may be redirected so as to communicate with the storage controller associated with the volume using the IP address of the storage controller. In this manner, the volumes and the virtual disks may be migrated, independently if desired, to other storage controllers in the network without disrupting the data flow between the application server and the storage controllers.
REFERENCES:
patent: 6480934 (2002-11-01), Hino et al.
patent: 2003/0200390 (2003-10-01), Moore et al.
SNIA IP Storage Forum, “iSCSI Technical White Paper”, Jul. 29, 2002, pp. 1-10.
Dalgic Ismail
Gilligan Robert Eugene
Jones F. Alan
Ozdemir Kadir
Dorsey & Whitney LLP
Intransa, Inc.
Vital Pierre
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