What is considered an acceptable backup data transfer rate, given today's solutions, measured in GB/hr per drive?
As far as I'm concerned, the only acceptable transfer rate is at least 125% of the rated native transfer rate of the drive, on average. I usually go for about 150%. Another way to say this would be about 75%-80% of the compressed speed. I architect everything I do based on that. I do all sorts of things to achieve that, including: 1. Tweaking multistreaming (how many backups are run at once).
2. Tweaking multiplexing (how many backups go to a given drive at once).
3. Adding disk to the mix to deal with low bandwidth networks.
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