While data deduplication reduces storage costs by reducing the storage footprint, there is a cost incurred during the restore processes. During the restoration of a deduplicated backup, NetVault SmartDisk has to reassemble the Chunks as it restores the data. This reassembly process, also called rehydration, lengthens the time to restore the data. Therefore, if the Recovery Time Objective (RTO) is important for a specific database, email, or file system, consider the trade-off between reducing storage costs and increasing RTO when you identify which data to deduplicate.
You can increase deduplication ratios by targeting backups from the same database, file system, or application to the same NetVault SmartDisk Instance. When a backup is deduplicated and a previous backup from the same database, file system, or application has already been deduplicated by the NetVault SmartDisk Instance, only the unique or new Chunks that did not exist in the previous backup have to be stored in the Chunk Store. If a previously deduplicated backup does not exist in the NetVault SmartDisk Instance, most of the backup is considered unique data; this issue increases the number of unique Chunks that have to be stored in the Chunk Store.
100 + (120) + (240) = 460 GB460/15360 =.029Rounded Up to Next Whole Number = 1 NetVault SmartDisk Instance460/5120 =.089Rounded Up to Next Whole Number = 1 NetVault SmartDisk Instance
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