The selection between synchronous or asynchronous mode is made according to the RPO/RTO ratio (described in the following paragraph), the distance and the level of availability desired. The quality of link between the sites should also be considered.
|Tolerance / Criticality of the Application||Data Protection strategy|
|RTO more than or equal to 72 hours||Restoration from backups on tape|
|RTO less than 24 hours||Restoration from a remote site, asynchronous replication|
|nul RPO / minimum RTO||Restoration from a remote site, synchronous replication|
|nul RPO/ metropolitan distance||Synchronous replication|
|nul RPO / departmental distance||Synchronous replication between both departmental sites and asynchronous replication between departmental sites and non-departmental sites|
The replication technologies can be applied at the storage level; replication is performed between two remote disk arrays connected through Fiber Channel (FC) technology, but it is also possible to perform a data replication through conventional TCP/IP network.
In synchonous mode, this technology provides an identical copy of the production volume, it is generally used for disaster recovery on another site, for tests or backup on a remote server executed from production data.
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