The following table shows the results of switching sites to perform maintenance.

Table 5-4 Results of switching sites to perform maintenance

Processing method	Protection mode	Results of switching sites to perform maintenance
		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 11	--	--
	never	1 to 3 4 to 11#3	4 to 11#3	8 to 11#3
All asynchronous method	--	1 2 to 11#3	2 to 11#3	8 to 11#3
Hybrid method	data	1 to 2 3 to 11#2	--	3 to 11#2
	never	1 to 2 3#2 4 to 11#2, 3	4 to 7#2, #3 8 to 11#2, #3	3 to 7#2 8 to 11#3

Legend:

1 to 11: Correspond to numbers in Table 5-2 Site switchover methods that can be used while the main site is running.

--: 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.