Controlling methods of storage control device and virtual volumes

Abstract

The storage control device of this invention allocates the physical storage area in RAID groups to virtual volumes in units of chunks including multiple pages. To the virtual volume 5 , in accordance with write accesses from the host 20 , the physical storage area in the pool is allocated. A RAID group 6 in the pool includes multiple chunks 7 . Each chunk 7 includes multiple pages 8 . To the virtual volume 5 , the physical storage area is allocated in units of chunks 7 . From the allocated chunks 7 , the pages 8 required for writing write data are used.

What is claimed is: 
     
         1 . A storage system comprising:
 a storage pool including a plurality of chunks provided with a plurality of storage devices,   a controller adapted to:   manage a plurality of pages in each of the plurality of chunks,   provide a plurality of volumes to a computer,   allocate a particular chunk in the storage pool to a first volume of the plurality of volumes, when a first write command from the computer to the first volume is received,   write data of the first write command to a first page of the plurality of pages in the allocated particular chunk, and   when a second write command from the computer to the first volume is received, write data of the second write command to a second page of the plurality of pages in the allocated particular chunk, the second page being selected in a serial manner after the first page is selected,   wherein the plurality of pages in the allocated particular chunk are used in a serial manner to store data for the first volume.