Information storage apparatus including an uninterruptible power supply (UPS) and an interlock control method of the same

An uninterruptible power supply (UPS) for supplying power to a disk array which includes a disk drive and a data cache and to a host, said UPS comprising:

• a first control port set for the disk array;
• and
• a second control port set for the host,
• wherein said first control port is coupled to the disk array and the second control port is coupled to the host,
• wherein said UPS supplies power to the disk array and the host, and
• wherein the UPS performs termination processing of the disk array and termination processing of the UPS after performing termination processing of the host and cache flush processing of the disk array.

An interlocking control method for use in an uninterruptible power supply (UPS) that supplies power to a disk array which includes a disk drive and a data cache and a host, said method comprising:

• performing termination processing of the host;
• performing cache flush processing of the disk array;
• performing termination processing of the disk array after performing the termination processing of the host and the cache flush processing of the disk array;
• and
• performing termination processing of the UPS.