Patent ID: 8356292
Filing Date: 2013-01-15
Classification: G06F

Abstract:
1. A method for updating a control program of a physical storage device (PSD) in a storage virtualization system, comprising the steps of: selecting at least one PSD to be updated with a control program thereof; making the selected PSD enter an off-line state; updating the control program of the selected PSD, wherein if it needs to issue a write request to the selected PSD before completion of the control program update, an unmodified data segment corresponding to the write request is marked as a modified data segment; and performing a partial rebuilding on the at least one selected PSD after completion of the control program update, wherein if it needs to read data out from or write data into the unmodified data segment of the selected PSD before completion of the partial rebuilding, a read or write request is issued to the selected PSD directly without waiting for completion of the partial rebuilding of all the modified data segments in the selected PSD.