| US 7,543,129 B2 | ||
| Storage system and storage area allocation method configuring pool areas each including logical volumes having identical allocation unit size | ||
| Tomoyuki Kato, Odawara (Japan); and Kenji Yamagami, Odawara (Japan) | ||
| Assigned to Hitachi, Ltd., Tokyo (Japan) | ||
| Filed on May 24, 2006, as Appl. No. 11/439,138. | ||
| Claims priority of application No. 2006-092236 (JP), filed on Mar. 29, 2006. | ||
| Prior Publication US 2007/0233993 A1, Oct. 04, 2007 | ||
| Int. Cl. G06F 12/08 (2006.01) | ||
| U.S. Cl. 711—171 [711/114; 711/170] | 20 Claims |
| 1. A storage system comprising a storage device unit constituted by a plurality of disk devices for storing data, and a control
unit for controlling input/output said data as requested by a host computer,
wherein the control unit configures the disk devices into a plurality of logical volumes each with a logical volume identification
number, an emulation slot type, a logical volume size, and an allocation unit size, the plurality of logical volumes include
at least two different allocation unit sizes,
the control unit receives a pool area generation command and configures a plurality of pool areas each of which includes some
of the logical volumes that have an identical emulation slot type and an identical allocation unit size,
the control unit generates a virtual logical volume in response to a virtual logical volume generation command which includes
information of a virtual logical volume size of the virtual logical volume, and allocates one of the pool areas to the virtual
logical volume, and
in response to a write request addressed to the virtual logical volume, the control unit, if no unused storage area available
in said one of the pool areas allocated to the virtual logical volume, selects one of the pool areas that has an allocation
unit size closest to a size of write target data of the write request, selects an unused storage area in one of the logical
volumes belonging to the selected pool area, and writes the write target data into the selected unused storage area.
|