Synchronous SnapMirror is a SnapMirror feature in which the data on one filer is replicated on another filer at, or near, the same time it is written to the first filer. Synchronous SnapMirror synchronously replicates data between single filers or clustered filers situated at remote sites using either an IP or a Fibre Channel connection.
The filer requires a software license to enable the SnapMirror Sync service.
Network Appliance provides you with the appropriate license codes when shipping you the software or when giving you instructions for obtaining the software over the Internet