Fujitsu Corporation

Hitachi, Ltd.

Akira Hayakawa

Masakazu Sakamoto

Yuichiro Sugimoto

Ryutaro Kurusu

Hidehiko Tanaka

Takaki Nakamura

Keiichi Matsuzawa

Takayuki Fukatani

An aspect of this invention is a computer system, including: a storage apparatus for allocating real storage areas of a plurality of tiers of a tiered real storage area pool to a volume, and migrating and relocating data within the volume between the plurality of tiers; and a host apparatus that accesses the volume provided by the storage apparatus. The host apparatus is configured to refer to tier information including information on a corresponding one of the plurality of tiers to which an access destination address within the volume belongs to identify the corresponding one of the plurality of tiers to which the access destination address belongs and refer to settings predetermined for the plurality of tiers to perform I/O control for the access destination address based on settings of the identified corresponding one of the plurality of tiers.

Computer system and method of controlling I/O with respect to storage apparatus

A schedule execution managing apparatus comprises a planned start time setting unit setting the planned start time of a schedule in correspondence with a predetermined base time and an offset from the base time, a planned start time storing unit storing the set planned start time, and a schedule execution controlling unit controlling the execution start of the schedule by referencing the contents stored in the planned start time storing unit. With this apparatus, a schedule change in an emergency is facilitated, and schedule information can be easily reused in a different environment.

Schedule execution managing apparatus and method

An information management system of the present invention includes an information management apparatus and an information request apparatus. The information management apparatus acquires, each time a state of an object varies, state information on these state variations and stores a storage module with the state information. Thereafter, when the information request apparatus makes a request for providing the state information, the information request apparatus is provided with, as difference information, the state information ranging from a piece of state information indicating that the state varies next to the state information provided last to the information request apparatus before receiving the providing request up to a latest piece of state information among plural pieces of state information stored in the storage module.

Information management system

A end report of the unloading operation is issue to a host computer for a period of time after the start of the ejecting operation of a medium cartridge of a recording/reproducing unit based on an unloading command until before the end of the unloading operation, thereby allowing the next moving command to be issued precedently to the end of the actual unloading operation. Simultaneously there for with that the unloading operation is instructed to the recording/reproducing unit on the basis of the unloading command, the end report of the unloading operation is executed to the host computer, thereby allowing the host computer to issue the next moving command. In a data transfer control between the host computer and a control unit of a library apparatus, when the number of error times of the data transfer errors exceeds a threshold value, the subsequent data transfer speed is switched to the executable data transfer speed at which the data transfer can be retried, and the data transfer is executed.

Control apparatus and method for conveyance control of medium in library

A end report of the unloading operation is issued to a host computer for a period of time between after the start of the ejecting operation of a medium cartridge of a recording/reproducing unit based on an unloading command until before the end of the unloading operation, thereby allowing the next moving command to be issued precedently to the end of the actual unloading operation. Simultaneously with that the unloading operation is instructed to the recording/reproducing unit on the basis of the unloading command, the end report of the unloading operation is executed to the host computer, thereby allowing the host computer to issue the next moving command. In a data transfer control between the host computer and a control unit of a library apparatus, when the number of error times of the data transfer errors exceeds a threshold value, the subsequent data transfer speed is switched to the executable data transfer speed at which the data transfer can be retried, and the data transfer is executed.

Growing community of inventors

Yokohama, Japan

Akira Hayakawa