Patent ID: 7430644
Filing Date: 2008-09-30
Classification: G06F

Abstract:
1. A storage device which includes a plural number of logical memory devices by agglomeration of a plural number of physical memory devices and is accessed by a plural number of computers, said storage device comprising: a partition management table which comprises one or more pairs, each said pair comprising a logical memory device identification (ID) discriminating one of the logical memory devices and partition propriety information indicating a propriety of partition; an access control table including a pair comprising the logical memory device ID and a computer ID discriminating a computer to which the logical memory device discriminated by the logical memory device ID is partitioned and accessible; an access control setting means for: an access control means for approving the access from a computer which required the access to the logical memory device, based on the computer ID and the logical memory device ID partitioned, by referring to the access control table; a partition condition defining table including a pair of at least one property condition, which is used for judging whether the logical memory device can be partitioned or not, and a partition propriety information showing a propriety of partition to a computer; and a property table including a pair comprising a logical memory device ID and property information corresponding to the logical memory device; and a utilization condition setting means for determining the partition propriety of the logical memory device based on a content of the partition condition defining table and a content of the property table and renewing the partition management table, the property table including, as the property information, a reliability and a duplication setting for each logical memory device, the partition condition defining table including the reliability and duplication setting as the property condition and the partition propriety information which indicates that a partition is possible when the reliability is high, a partition is possible when the reliability is low and the duplication setting is set and a partition is impossible when the reliability is low and the duplication setting is not set, and the utilization condition setting means renewing the partition propriety information for each logical memory device of the partition management table in accordance with the property table and the partition condition defining table.