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Q: 

Performance of loopback file systems

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

PS: I am asking this question on stackoverflow because I did not get any response from serverfault.

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