Patent ID: 8463910

Claim:
A computer system, comprising: a plurality of physical servers each with a set of one or more application logical partitions and I/O logical partitions built therein; a storage apparatus for providing a storage area to the physical servers; and a management server connected to the physical servers, wherein the application logical partition of the physical server is configured to execute processing according to a user's application, wherein the I/O logical partition of the physical server is configured to control execution or wait of I/O processing of the application logical partition, wherein the management server is configured to: among network paths connecting the physical server and the storage apparatus, detect the network path that is shared by a plurality of the application logical partitions and a maximum performance of the relevant network path; calculate, for each of the application logical partitions sharing a relevant network path, a share ratio defined as a ratio of required performance for each of the application logical partitions to the maximum performance of the network path to which each of the application logical partitions is coupled, and set a period of time for a corresponding application logical partition to execute or cause the I/O processing to wait, in a unit time, to each of the I/O logical partitions based on the calculated share ratio of each of the application logical partitions; and wherein the I/O logical partition of the physical server is configured to control the execution or wait of the I/O processing of a relevant application logical partition so that the corresponding application logical partition is configured to execute or cause the I/O processing to wait in the period of time set by the management server, wherein upon receiving a migration command for migrating the application logical partition to another one of the physical servers recalculate the share ratio of each of the application logical partitions sharing the relevant network path based on the maximum performance of the network path that is being used by the relevant application logical partition and the required performance of each of the application logical partitions sharing the relevant network path after migrating the application logical partition to be migrated to the physical server of a migration destination, and set the period of time for the corresponding application logical partition to execute or cause the I/O processing to wait, in a unit time, to each of the I/O logical partitions based on the recalculated share ratio of each of the application logical partitions.