Patent ID: 7908445
Filing Date: 2011-03-15
Classification: G06F,H04L

Abstract:
1. A method for performing a dynamic logical media unit (LMU) reassignment in a storage virtualization subsystem (SVS) including a plurality of redundant storage virtualization controllers (SVCs) and a physical storage device (PSD) array connected thereto, said PSD array comprising at least one PSD, said SVS defining at least one logical media unit (LMU) comprising sections of said PSD array, said plurality of redundant SVCs comprising a first SVC and a second SVC, said at least one LMU comprising a first LMU, the method comprising the steps of: providing a mapping that maps combination of the sections of the PSD array to said at least one LMU visible to a host; determining, when said first SVC and said second SVC are on line, whether a reassignment start timing is reached, wherein said reassignment start timing is used to determine a timing when LMU ownership reassignment of said first LMU is performed in order to reassign, from said first SVC to said second SVC, an LMU ownership of said first LMU; and reassigning, when said first SVC and said second SVC are on line, said LMU ownership from said first SVC to said second SVC to enable said second SVC to execute an input/output (IO) request addressing said first LMU if said reassignment start timing is reached; wherein said reassigning comprises the steps of: