Method and apparatus for data relocation between storage subsystems
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United States of America Patent
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May 17, 2005
Grant Date -
Nov 27, 2003
app pub date -
Sep 5, 2002
filing date -
May 27, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A storage subsystem that has detected the necessity of the data relocation determines whether the data relocation is possible or not from one storage unit to another within the particular storage subsystem. A virtualization device is notified in the case where the data relocation in the particular subsystem is impossible. The manager of the virtualization device gives an inquiry to the storage subsystems as to whether any one of them can become a relocation destination or not. A storage subsystem determines, based on the related information, whether the data relocation requested is possible or not within the particular storage subsystem. In the case where such a relocation is possible, the copying process is carried out for data relocation from one storage subsystem to another in compliance with an instruction from the virtualization device.
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