Patent ID: 7107485

Claim:
A storage medium storing a program for when executed, making an active computer which holds a first disk management information buffer adapted to store physical device names of volumes stored in a disk device and volume Identifiers with correspondence between the physical device names and the volume identifiers, function as: a monitor for detecting that execution of a replica corresponding to a volume is completed in said disk device; and a first switching unit of a standby computer, responsive to the result of the detection in said monitor, for determining to transmit, to said standby computer, a notice for informing said standby computer that a volume identifier stored in said volume subjected to the execution of the replica is changed, wherein said program in said storage medium, when executed, making said standby computer which holds a second disk management information buffer adapted to store in corresponding relation physical device names of volumes and volume identifiers and a replica status management table adapted to manage a status concerning the presence or absence of a volume identifier, function as a second switching unit of said standby computer for executing: a first process in which when said notice to the effect that said volume identifier stored in said volume is changed is received from said active computer, a first flag is stored in said replica status management table in correspondence with said physical device name of said volume, a second process including a step of deciding as to whether said first flag is stored in said replica status management table in correspondence with said physical device name according to which said volume identifier stored in said volume is acquired and said acquired volume identifier is stored in said second management information buffer in correspondence with said physical device name of said volume, and a third process in which when said second process is completed, said first flag stored in said replica status management table in correspondence with said physical device name is erased.