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Has anyone done any performance/benchmarking tests on Linux loopback file systems? What has your experience been so far. Is there any serious degradation in performance? How about robustness?

http://freshmeat.net/articles/virtual-filesystem-building-a-linux-filesystem-from-an-ordinary-file

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It should be quite simple to run bonnie++ on your native disk and on a loopback disk in order to compare the performance. –  ceving Sep 5 '11 at 14:18
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I've had no problems. It's all been rock-solid. The filesystem cache and IO scheduler in Linux are sensible enough that it shouldn't make any noticable difference between asking for a disk directly and asking for a section of a file on a disk.

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