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Dealing with deduplication|
New VTL?features dramatically increase the amount of data that can be stored on disk, but they add to the complexity of copying data from disk to tape. The compression algorithm in the VTL may not be the same as the one used by the target tape drive. This forces an admin to do one of three things when copying data to tape:
Deduplication on VTLs creates similar issues. Because tape drives don't natively support deduplication, a VTL with deduplicated data must first reconstruct the data in its native format before sending it to tape. This requires reserving sufficient
| time and ensuring that the VTL's performance is sufficient to reconstruct the deduplicated data before copying it off to tape. Technically, the deduplicated data can be copied to tape, but that reintroduces the dependency on the VTL for recoveries.
This was first published in December 2007