| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce a data transfer amount in the case that an operating system storage coincides with a standby system storage (for example, use of a shared storage). <P>SOLUTION: In this invention, when a read-out instruction occurs in a shared storage in a virtual machine of an operating system, a read-in position, a read-out position and a read-out size of the read-out instruction are stored in storing means, and when a write-in instruction occurs in the shared storage, difference information from the preceding synchronization time is acquired and transmitted to a virtual machine of a standby system, and the read-in position, the read-out position and the read-out size are acquired from the storing means and transferred to the standby system. In the virtual machine of the standby system, the difference information received from the virtual machine of the operating system is reflected on the virtual machine of the standby system, and data of the shared storage specified at the read-out position is read in the virtual machine of the standby system specified at the received read-in position as much as the read-out size. <P>COPYRIGHT: (C)2013,JPO&INPIT |
