There are several ways to switch sites. The following table describes these methods.

Table 5-1 Site switchover methods

Site switchover method	Description	Can the devices at the main site be stopped (after switching sites)?	Can sites be switched again (immediately after switching sites)?
Switching sites to test disaster preparedness	Operation switches to the remote site while the main site is still running.	Prohibited	Yes
Switching sites to perform maintenance	Used to run operations at the remote site only. For example, used when temporarily stopping update copy while performing device maintenance at the main site.	Yes	No
Switching sites in the event of a disaster	Used when a disaster occurs at the main site and operations cannot continue there.	-- (Shut down by a disaster)	No

Legend: --: Not applicable

Note

When switching sites to perform maintenance or in the event of a disaster, data loss might occur or switching sites might not be possible depending on the specification of the Real Time SAN Replication processing method and the protection mode. For details, see 5.1.4 Results of switching sites to perform maintenance or 5.1.5 Results of switching sites in the event of a disaster.