NetApp
Vserver : SnapMirror : Understanding SnapMirror technology : How SnapMirror works
How SnapMirror works
You create a SnapMirror relationship between a source volume and a destination volume. The source volume is a read/write volume that clients can access and modify. The destination volume is a read-only volume that exports a Snapshot copy to clients for read-only access.
Snapshot copies are used to update destination volumes. Snapshot copies are transferred from the source volume to the destination volume using an automated schedule or manually; therefore, mirrors are updated asynchronously.

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