Hierarchical storage system
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United States of America Patent
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Jun 19, 2012
Grant Date -
May 6, 2010
app pub date -
Jan 9, 2009
filing date -
Oct 31, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
Pools of a plurality of types of storage devices are configured and are included in different layers. Based on at least one storage device of the same type, the pools of types corresponding to the type are configured. The controller in the storage system carries out storage location change processing in which the storage location of targeted data that has been stored into the targeted first real page allocated to a virtual page in a virtual volume is changed to the second real page that has not been allocated in a pool of the second type different from a pool of the first type including the targeted first real page in the case in which the controller conforms to the prescribed storage location change conditions. A size of a real page is different depending on a type of a pool.
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