Electrical computers and digital processing systems: memory – Address formation – Address mapping
Reexamination Certificate
2011-03-22
2011-03-22
Elmore, Stephen C (Department: 2185)
Electrical computers and digital processing systems: memory
Address formation
Address mapping
C711S114000, C711S147000, C711S150000, C711S154000, C711S156000, C711S163000, C711S165000, C710S020000, C710S021000, C714S006130, C714S019000, C709S217000
Reexamination Certificate
active
07913056
ABSTRACT:
A clustered storage array consists of multiple nodes coupled to one or more storage systems. The nodes provide a LUN-device for access by a client. The LUN-device maps to a source logical unit corresponding to areas of storage on the one or more storage systems. A target logical unit corresponds to different areas of storage on the one or more storage systems. The source logical unit is migrated in parallel by the multiple nodes to the target logical unit. Data to be copied from the source logical unit to the target logical unit are grouped into data chunks. Two or more of the plurality of nodes concurrently attempt to acquire an exclusive lock for a set of data chunks. The node acquiring the exclusive lock migrates the set of data chunks from the source logical unit to the target logical unit, while the exclusive lock is used to prevent other nodes from migrating the set of data chunks.
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PCT/US2005/046433 International Search report; Aug. 9, 2006; 4 pgs.
Brown Michael F.
DesRoches David W.
Madnani Kiran P.
Ayash Marwan
Elmore Stephen C
EMC Corporation
Guerin & Rodriguez LLP
Rodriguez Michael
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