Virtual storage system and method for allocating storage areas and releasing storage areas from allocation based on certain commands
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United States of America Patent
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Mar 6, 2012
Grant Date -
Jun 9, 2011
app pub date -
Jan 28, 2011
filing date -
Feb 18, 2004
priority date (Note) -
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Abstract
The storage system includes a plurality of storage devices and a controller that manages a virtual volume including a plurality of virtual storage areas, and manages a storage pool including a plurality of storage areas prepared on the storage devices in order to allocate a storage area in the storage pool to the virtual volume in response to receiving a write command to the virtual volume for writing data corresponding to the write command. In response to receiving a specific write command to write a specific data to a first virtual storage area to which a first storage area is allocated, the controller releases the first storage area from the first virtual storage area.
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