Patent ID: 7191251
Filing Date: 2007-03-13
Classification: G06F,Y10S

Abstract:
1. A storage control sub-system of a storage control system connected to a host terminal, comprising: a plurality of physical storage devices, a plurality of logical storage devices prepared in accordance with said plurality of physical storage devices; a virtual storage unit configured from a plurality of virtual storage regions and implemented in said storage control sub-system by establishing a virtual storage capacity value a memory for storing said established virtual storage capacity value; and a storage control section for receiving a write request from said host terminal, wherein a pool configured from one or more first logical storage devices of said plurality of logical storage devices exists, said logical storage devices from which said pool is configured being configured from two or more logical storage regions, wherein said storage control section, which is configured in such a way that when said write request is received an association is created between an unassigned logical storage region of the plurality of logical storage regions of said pool and the virtual storage region of said virtual storage unit as specified by said write request and data is written in accordance with said write request in said assigned logical storage region, reports the virtual storage capacity value stored in said memory to said host terminal, and ensures that reported virtual storage capacity value is not changed while said reported virtual storage capacity value is being stored in said host terminal.