Hitachi, Ltd.

Norichika Hatabe

Takeaki Murakoso

Michiaki Sekine

Tsutomu Sugita

Hiroyuki Takabayashi

In a computer system of the present invention, whether or not master data has been updated is managed for each division key as master data management information. If the master data has been updated, a job is re-executed, but when the job is re-executed, data is divided using only a division key corresponding to updated master data, and thereby a sub-job which is a re-execution target is localized with the division key unit so as to re-execute a job.

Job management system that determines if master data has been updated, then re-executes a sub-job based on available executing computers and data sharing status

A tape management method capable of easily using a file on a virtual tape from a plurality of programs in a system virtually emulating a magnetic tape apparatus by a disk apparatus. When a use request is generated from other program to a volume of a virtual tape used by one program, a host computer generates and uses a volume of a temporal virtual tape and can thus permit the use of the temporal tape volume from a plurality of programs without drastically changing the specification of an existing tape interface. The volume of the virtual tape temporarily generated is generated in a virtual tape management table and a virtual tape file uses a file of the same type.

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Hiratuka, Japan

Norichika Hatabe