Comparison of mirroring methods

The information in the following table compares the various methods that you can use to mirror your volumes.

Table 1. Volume mirroring comparison
Description	Local volume mirroring	Metro Mirror	Global Mirror	HyperSwap^®
Number of sites that host application data	1	2¹	2¹	2
Support multipathing failover between mirrored copies with no application impact	Yes	No	No	Yes
Maximum distance between copies	Within data center	Up to 300 km²	Up to 25000 km²	Up to 300 km²
Host completion that is delayed by secondary write operation	Yes	Yes	No	Yes
Bandwidth that is required on inter-site link	Not applicable	Maximum peak write bandwidth	Varies³	Maximum peak write bandwidth
¹ Multiple partnerships permit configurations with three or four sites. ² Subject to application and other constraints. See also the topic Long-distance links for Metro Mirror and Global Mirror partnerships. ³ For more information, see the information about copy types in the topic Metro Mirror and Global Mirror relationships.