Patent ID: 9229652
Filing Date: 2016-01-05
CPC Classification: G06F

Claim Text:
1. A computer system comprising: a control device for processing a write access from a host computer, and at least one storage device, wherein the control device is configured to: provide a logical volume, provide a plurality of first pools, each of which having one or more pool volumes provided by storage areas of the at least one storage device, provide a second pool, having a one or more pool volumes provided by storage areas of the at least one storage device, allocate a storage area from one of the first pools to a logical area of the logical volume to store data to the logical area, and store the data in the allocated storage area, add at least one of the one or more pool volumes in the second pool to the first pool, according to the status of the first pool, and add at least one pool volume provided by storage areas of at least one storage device to the second pool, according to the status of the second pool.