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When deduplicated files are replicated to another cluster through SyncIQ or backed up to a tape device, the deduplicated files are inflated (or rehydrated) back to their original size because they no longer share blocks on the target cluster. However, once replicated data has landed, SmartDedupe can be run on the target cluster to provide the same space efficiency benefits as on the source.
Shadow stores are not transferred to target clusters or backup devices. Thus, deduplicated files do not consume less space than non-deduplicated files when they are replicated or backed up. To avoid running out of space on target clusters or tape devices, verify that the total amount of storage space saved, and storage space consumed, does not exceed the available space on the target cluster or tape device. To reduce the amount of storage space consumed on a target cluster, you can configure deduplication for the target directories of your replication policies. Although such configuration will deduplicate data on the target directory, it will not allow SyncIQ to transfer shadow stores. Deduplication is still performed post-replication, by means of a deduplication job running on the target cluster.