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Access "How faster tape drives can slow down your backups"

Published: 20 Oct 2012

With so many disk-to-disk backup options available, it just doesn't make sense to back up directly to tape over the network. A LAN-based backup system can't deliver the throughput required to stop a modern tape drive from "shoe-shining." Simply put, you can't back up via a LAN directly to today's high-speed tape drives without an interruption in the data stream; this requires the tape to be repositioned on the drive's heads, which causes a "stop-start" or "shoe-shine" motion on the tape device that slows performance. To record a high-quality signal to tape, the recording head must be moved across the media very quickly. This is why modern tape drives have a minimum speed; if they went slower than their rated minimum, they wouldn't record a good quality signal and would lose data. This is an unchangeable fact about tape drives: They have a minimum usable speed. That's why all tape drives designed for large-scale backups have two speeds: stop and very fast. This also applies to variable-speed tape drives. If you have a 50MB/sec tape drive and you send it a ... Access >>>

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