| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To make imperfect data be identified by a standby device, and prevent malfunction even if an active device is downed in a middle of updating data to a standby device, and the imperfect data are left in a main memory device of the standby device. <P>SOLUTION: A flag area is prepared just after each call information data per a unit to be updated for call information which is managed in the main memory device 13. An active system device 1 updates and manages call information, when it updates call information data and copies in a standby device 2, it writes "0" in a flag area which belongs to the call information data using a RDMA (Remote Direct Memory Access) function part 12 before copying, next, copies the information data using the RDMA function part 12, and at last, writes "1" in the flag area which belongs to the information data using the RDMA function part 12. The standby device 2 checks all call information data before succeeding the processing, if call information data whose flag area is "0" is found, the data are made invalid. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
