Specifically, VTL solutions emulate a tape library. Therefore, only applications that have specific support for tape libraries can utilize the VTL, making it a limited application in itself.
Many of the utilities that are prevalent in the data center typically dump data to disk and do not support tape protocol. Many data protection utilities cannot support copying data to a VTL.
Most of the limitations for consideration of VTL solutions with data de-duplication center on the added management complexity and on the in-line versus post processing debate. In general, the added virtual tape management needed to emulate a tape on disk adds more complexity to an already complex environment.
Post processing further complicates ongoing daily management and has a negative impact on time to de-duplicate and time to replicate (or create the DR copy). Post processing also requires additional disk capacity to act as a de-duplication landing pad.
Ultimately, more capacity means more disk to manage, more power and cooling, more floor space, and of course, more spindles to purchase. Adding the ability to do data de-duplication as a feature to an existing VTL product has thus far been implemented by using the less efficient post-process method of de-duplication.
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