Patent ID: 9400618
Filing Date: 2016-07-26
CPC Classification: G06F,G09B

Claim Text:
1. A storage system comprising: a storage controller; and a plurality of flash packages, wherein each of the plurality of flash packages includes a plurality of flash memory chips storing a plurality of generations of data which are associated with a logical storage area of a logical address and provides the storage controller access to the logical storage area; wherein the storage controller is configured to access data of any generation and manage a plurality of real pages based on the logical storage area provided by the plurality of flash packages, wherein the storage controller is configured to generate, based on a first logical volume, a second logical volume, wherein the storage controller is configured to allocate a real page among the plurality of real pages to both a first part of the first logical volume where the first part is configured to be an access target of first data of a first generation and a second part of the second logical volume where the second part is configured to be an access target of second data of a second generation, wherein the first generation and the second generation are different, wherein on a condition that a number of empty real pages included in the plurality of flash packages is less than a prescribed threshold: