The following table shows the results of switching sites in the event of a disaster.

Table 5-5 Results of switching sites in the event of a disaster

Processing method	Protection mode	Results of switching sites in the event of a disaster
		No restriction	Restricted
		Can be switched over without data loss#1	Can be switched over with data loss#1	Data inconsistency; cannot be restarted
All synchronous method	data	1 to 3	--	--
	never	1 2 to 3#3	2 to 3#3	2 to 3#3
All asynchronous method	--	1 to 3#3	1 to 3#3	--
Hybrid method	data	1 to 3#2	--	1 to 3#2
	never	1#2 2 to 3#3	2 to 3#3	1#2 2 to 3#3

Legend:

1 to 3: Correspond to numbers in Table 5-3 Site switchover methods that can be used when a disaster occurs at the main site.

--: Not applicable

#1

Includes a restart failure accompanying a volume error.

#2

Limited to cases in which no error occurred during the operations explained in 4.2 Notes on operation when using the hybrid method

#3

The result varies depending on the scope of the error.