Storage apparatus, control apparatus, and storage apparatus control method

A control apparatus including

• a control unit configured to control backup of data to a backup area provided in one or more storing units of a storage apparatus,
• wherein the control unit includes
• a pointer control unit which controls, in the backup area, an available area start pointer indicating a start of an available area that is available for the backup and an available area end pointer indicating an end of the available area,
• a backup instruction receiving unit which receives a backup instruction related to control of the backup,
• a backup processing unit which performs, when the backup instruction is a backup start instruction instructing a start of the backup, a backup process in which the available area is allocated to backup target data based on the backup start instruction, the allocation of the available area being started from a position indicated by the available area start pointer,
• a releasing unit which releases, when the backup instruction is a backup end instruction instructing an end of the backup, an area allocated to backup target data based on the backup end instruction, and
• a determining unit which determines whether the released area is adjacent to a position indicated by the available area end pointer, and
• when the determining unit determines affirmatively, the pointer control unit moves the available area end pointer to an end of the released area.

A storage apparatus control method for controlling backup of data to a backup area provided in one or more storing units, the storage apparatus control method comprising:

• receiving a backup instruction related to control of the backup;
• releasing, when the backup instruction is a backup end instruction instructing an end of the backup, an area allocated to backup target data based on the backup end instruction;
• and
• determining whether the released area is adjacent to a position indicated by an available area end pointer indicating an end of an available area that is available for the backup,
• wherein when the released area is determined to be adjacent to the position indicated by the available area end pointer, the available area end pointer is moved to an end of the released area.