You might need to mark the partition of the DDB for recovery in the following situations:
- When the drive hosting the DDB is lost or the DDB files are missing and the DDB is recovered by the DDB Move operation.
Procedure
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From the CommCell Browser, expand Storage Resources > Deduplication Engines > storage_policy > deduplication_database. 
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Right-click the appropriate partition, and then click Mark for Recovery. A message appears that asks you to mark this partition for recovery. 
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Click Yes. A message appears that tells you that the partition is successfully set for recovery. 
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Click OK.