Disk time-sharing apparatus and method

摘要

A disk time-sharing apparatus is constructed by a disk apparatus having disk drives, an input/output request unit for issuing an input/output request to the disk apparatus, and an input/output scheduling unit. The input/output scheduling unit forms input/output groups obtained by grouping inputs/output sources to/from the disk apparatus, defines a ratio of time during which each input/output group uses the disk apparatus, and decides quanta (allocating time) tau 1 to tau 3 during which each input/output group can use the disk apparatus continuously on the basis of the defined time ratio. When input/output requests are received to the disk apparatus from a plurality of input/output groups, a time-sharing for using the disk apparatus by switching the allocating time tau 1 to tau 3 sequentially among the competing input/output groups is performed. <IMAGE>