All block data replication schemes are not created equal. Some are implemented as part of the storage array, others as part of a host server and still others within the network. Replication can also happen synchronously--where the local application waits for confirmation from the mirror before a write is completed--or asynchronously, where there can be some lag between the source and the target data. The following matrix shows some sample replication products and where they fit in. (Note that some of these products may be applicable in more than one box.)
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SYNCHRONOUS
ASYNCHRONOUS
Array
EMC SRDF, Hitachi TrueCopy, IBM PPRC
HDS TrueCopy, EMC SRDF, IBM PPRC
Host
Veritas Volume Replicator
Veritas Volume Replicator
Network
FalconStor IPStor Mirroring
Topio SANsafe, DataCore SANsymphony, Asynchronous Internet Mirroring (AIM)
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