Patent ID: 8296601

Claim:
A takeover method, implemented in a computer system including a management server, one or more first servers performing tasks, and one or more second servers, each of the one or more first servers and the one or more second servers being logically partitioned into one or more logical partitions, for a logical partition on one of the one or more second servers to take over at least one task performed in a logical partition on one of the one or more first servers, the takeover method comprising: a remapping information acquisition step for acquiring, by the management server, I/O device configuration information of I/O devices included in the one or more first servers and the one or more second servers, and acquiring remapping information showing relations between the I/O devices included in the one or more second servers and I/O devices included in the one or more first servers and I/O devices available to be used in the one or more second servers; a second server selecting step for selecting, by the management server, in a case where a logical partition on one of the one or more second servers takes over at least one task performed in a logical partition on one of the one or more first servers, a second server which includes I/O devices corresponding to the I/O devices in the first server performing the task to be taken over and available to be used from the one or more second servers based on the remapping information and the I/O device configuration information of the one or more second servers and the one or more first servers to determine the second server for taking over the task performed in the first server; a resource mapping information creating step for creating, by the management server, resource mapping information showing identifiers of I/O devices to be allocated to the logical partition on the selected second server corresponding to the logical partition on the first server performing the task to be taken over; a logical partition creating step for creating, by the selected second server which includes a resource mapping program for mapping the I/O devices, as well as CPUs, and memories in the selected second server to logical partitions, a logical partition and allocating I/O devices, a CPU, and a memory in the selected second server to the created logical partition corresponding to the logical partition on the first server performing the task to be taken over based on the resource mapping information; and a takeover step for taking over, by the management server, the at least one task performed in the logical partition on the first server to the logical partition created on the selected second server, wherein the resource mapping program includes a function to map the I/O devices, the CPUs, and the memories in the selected second server for exclusive use by a single logical partition, and wherein, in the logical partition creating step, the selected second server allocates the I/O devices, the CPU, and the memory for exclusive use by the created logical partition, based on the remapping information.