The following table shows the site switchover methods that can be used while the main site is running.

Table 5-2 Site switchover methods that can be used while the main site is running

No.	Site switchover method	Main site		Remote site		Route
		Server machine	Hitachi disk array system	Server machine	Hitachi disk array system
1	Switching sites to test disaster preparedness Switching sites to perform maintenance#	Normal operation	Normal operation	Normal operation	Normal operation	Normal operation
2	Switching sites to perform maintenance#	Error	Normal operation	Normal operation	Normal operation
3		Normal operation	Error	Normal operation	Normal operation
4		Error	Normal operation	Normal operation	Normal operation	Error
5		Normal operation	Error	Normal operation	Normal operation
6		Error	Error	Normal operation	Normal operation
7		Normal operation	Normal operation	Normal operation	Normal operation
8		Normal operation	Normal operation	Normal operation	Error	--
9		Error	Normal operation	Normal operation	Error
10		Normal operation	Error	Normal operation	Error
11		Error	Error	Normal operation	Error
12	Cannot be switched over	Normal operation	Normal operation	Error	Normal operation
13		Normal operation	Error	Error	Normal operation
14		Error	Normal operation	Error	Normal operation
15		Error	Error	Error	Normal operation
16		--	--	Error	Error
17		--	--	Disaster	Disaster
18		--	Paired	--	Paired

Legend:

Normal operation: A state in which neither an error nor a disaster has occurred, and indicates that all devices are functioning normally.

Error: An error has occurred in one or more of the devices.

Error in the Route column means that all transmission of Hitachi disk array system data has stopped between the sites.

Paired: Indicates that the Hitachi disk array system's paired logical volumes are being generated or re-synchronized.

Disaster: Indicates that none of the devices at the site are functioning because of a disaster.

--: Normal operation, Error, Paired, or Disaster

#: The detailed results of switching sites to perform maintenance are described in 5.1.4 Results of switching sites to perform maintenance.