Which of the following is NOT a replication prerequisite for SnapMirror?

• A. The source volume must be offline.
• B. SnapMirror must be licensed for each storage system.
• C. If you are replicating a volume, you must create a restricted volume to be used as the SnapMirror.
• D. The capacity of the SnapMirror destination must be greater than or equal to the capacity of the source.

Answer: (A)

SnapMirror replication is designed to run while the source volume remains online; you don’t have to take the source offline to set up or maintain the mirror. To configure SnapMirror, you do need licenses on each storage system involved, since SnapMirror is a licensed feature. If you’re replicating a volume, you typically create a restricted volume on the destination to be used as the SnapMirror target, which helps protect the destination from regular I/O during initial transfer and ongoing replication. Finally, the destination must have enough capacity to hold the source data, so its capacity should be greater than or equal to the source volume’s capacity. So the statement that the source volume must be offline is not a prerequisite.