Computer system having data amount reduction function and storage control method

The computer system that includes a storage medium, a storage device having a storage device controller unit, and a storage controller unit connected to the storage device, wherein the storage device controller unit of the storage device is configured to execute:

• a capacity virtualization function that provides a virtualization address space in which storage capacity of the storage medium is virtualized and an actual address is specified by the virtual address;
• and
• a compression function of compressing data,
• the storage controller unit is configured to:
• execute a mapping function for managing mapping between logical address that is provided to a host system and a physical address corresponding to the virtual address;
• and when first data using a first logical address as a write destination and second data using a second logical address as a write destination duplicate with each other, change the mapping so that the first logical address and the second logical address were mapped in the same physical address, and transmit to the storage device a write command of predetermined data that functions the compression function by designating a virtual address that complies with the first physical address that were mapped in the first logical address before the change.

A storage control method performed by a computer system that includes a storage medium, a storage device having a storage device controller unit, and

• a storage controller unit connected to the storage device, wherein the storage device controller unit of the storage device executes:
• a virtualization function that provides a virtualization address space in which an actual address is specified by the virtual address;
• and
• an unmapping function of canceling mapping of an actual address in the storage medium with respect to a virtual address designated by an unmapping command,
• wherein the storage controller unit executes a mapping function for managing mapping between logical address that is provided to a host system and a physical address corresponding to the virtual address, and
• when first data using a first logical address as a write destination and second data using a second logical address as a write destination duplicate with each other, changes mapping so that the first logical address and the second logical address are mapped in the same physical address, and transmits to the storage device an unmapping command that functions the unmapping function by designating a virtual address that complies with the first physical address that were mapped in the first logical address before the change.

A storage control method performed by a computer system that includes a storage medium, a storage device having a storage device controller unit, and a storage controller unit connected to the storage device,

• wherein the storage device controller of the storage device executes capacity virtualization function that provides a virtualization address space in which storage capacity of the storage medium is virtualized and address is specified by the virtual address, and
• a compression function of compressing data,
• wherein the storage controller unit executes a mapping function for managing mapping between logical address that is provided to a host system and a physical address corresponding to the virtual address, and
• when first data using a first logical address as a write destination and second data using a second logical address as a write destination duplicate with each other, changes mapping so that the first logical address and the second logical address were mapped in the same physical address, and transmits to the storage device a write command of predetermined data that functions the compression function by designating a virtual address that complies with the first physical address that were mapped in the first logical address before the change.