Synchronous replication is the process of copying data over a storage area network (SAN), local
area network (LAN) or
wide area network (WAN) so
there are multiple up-to-date copies of the data.
Synchronous replication writes data to the primary and secondary sites at the same time so that
the data remains current between sites. Synchronous replication is more expensive than other forms
of replication, introduces latency that slows down the primary application and only works over
distances up to 300 km.
Synchronous replication is often used for disaster
recovery purposes. It is preferred for applications with low recovery time objectives (RTOs) that can't
tolerate data loss.
Synchronous replication can be contrasted with asynchronous
replication, a process where there is a delay before data is copied to a secondary site.
This was last updated in January 2011
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