Reasons
Reasons behind using D2D2T:
- increase performance of small, random-access restores: disk has much faster random access than tape
- increase overall backup/restore performance: although disk and a tape have similar streaming throughput, you can easily scale disk throughput by the means of striping (and tape-striping is a much less established technique)
- increase utilization of tape drives: tape shoe-shining effect is eliminated when staging (note that it may still happen on tape restores)
Read more about this topic: Disk Staging
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