Patent ID: 9134915
Filing Date: 2015-09-15
Classification: G06F

Abstract:
1. A computer system comprising: a plurality of physical computers each having a memory and a central processing unit (CPU); and a storage device, wherein a virtual computer generated by logically partitioning the memory and the CPU by a hypervisor operates on the physical computer, a first physical computer has a first physical host bus adapter (HBA), a first hypervisor which logically partitions the first physical HBA to generate a 1st logical HBA and a 1′st logical HBA, and a first virtual computer to which the 1st logical HBA with world wide name (WWN) the first OS generates first key information unique to the first OS, the first hypervisor monitors issuance of a first registration request including the first key information by the first OS, acquires the first key information included in the first registration request, stores the first key information in a first storage area of the 1st logical HBA, and transmits the first registration request to a storage controller managing the storage device through the 1st logical HBA, the first key information included in the first registration request is registered as access management information in the storage controller in association with WWN when migrating the first virtual computer onto a second physical computer, the first hypervisor reads the first key information stored in the first storage area and transmits a second registration request including the read first key information to the storage controller through the 1′st logical HBA, the first key information included in the second registration request is registered as the access management information in the storage controller in association with a second world wide name (WWN when the storage controller receives an access to a logical unit of the storage device from the 1′st logical HBA, access control is executed by determination on whether or not key information associated with WWN the allocation to the first virtual computer is switched from the 1st logical HBA allocated to the first virtual computer to the 1′st logical HBA with the registered WWN while the first virtual computer is migrated onto the second physical computer, the first OS which runs on the first virtual computer switches allocation to the first virtual computer, and accesses the logical unit through a link