Remote Mirroring – external replication
IBM FlashCopy
Metro Mirror
(Synchronous protocol, remote site data currency, metro distance, consistency groups)
Synchronous copy using Metro Mirror less than 300km
Global Copy
(Asynchronous protocol, period point-in-time currency, unlimited distance)
Global Mirror : global copy + flash copy
(Asynchronous protocol, remote site near-data currency, unlimited distance, consistency groups)
Global Mirror includes Global Copy function but is priced separately from Metro Mirror
Metro/Global Mirror : metro mirror + global mirror
(3-site with A-to-B synchronous(metro mirror) + B-to-C asynchronous(global mirror))
Two site: AB------C - periodic copy from A to B, unlimited distance
Three site: A---B---------------C - current data at B is forwarded to C
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