Hitachi, Ltd.

Yutaka Yoshimura

Toshiaki Tarui

Frederico Buchholz Maciel

Toru Shonai

Shin Kameyama

In a data center, when a server is disconnected from the Internet because of illegal manipulation of a file, valid files (not manipulated) are copied to a standby server and the processing is resumed after a short period of disconnection. According to the invention, a control program Pperforms manipulation checks for all files listed in a manipulation checklist. If any of them is manipulated, it issues a request to disconnect from the external network and a request to assign a standby server to a control program Pof a management server. Upon receipt of a disconnection completion signal and the address of a standby server b, the control program Pcopies valid files (not manipulated) to the standby server b, and for invalid files, requests the copies of their backup files. After finishing copying, the management server connects the standby server bto the external network to resume processing.

Processing takeover method in multiple computer system

When a load of a user is fluctuated, a data center dynamically changes resource allocation to the user according to the load and holds security for each user. A control program on a data center managing server creates a VLAN configuration table so as to allocate a user-dedicated VLAN including plural network switches for each user company, thereby configuring the ports of a load balancer and network switches allocated to a user to the user-dedicated VLAN. A VPN is configured from the user to the data center, whereby a VLAN tagging technique is used to hold security of the user from the user to the data center. The control program compares a user condition setting table created along the service level agreement for each user with the monitoring result of the computer operating state (the CPU utilization history in a VLAN operation table) to dynamically change the computer allocation and VLAN configuration at unsatisfied agreement. Specifically, the VLAN configuration table and the VLAN operation table are changed to change the VLAN configuration in the load balancer and the network switches (in the case of the Web layer). The control program changes the parameter (the sever allocation history in the VLAN operation table) related to charge information based on that.

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Hadano, Japan

Yutaka Yoshimura