The problem of blocks overwriting by multiple writers for raw devices

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Hi Jens,

Question/suggestion (I am almost sure that it was already discussed here, but maybe ...):

Why not to divide a raw device size for multithreaded write by number of threads and let every thread to write on a separate chunk (as you do for FS - every thread writes to a separate file)? This will solves the problem of blocks overwriting by multiple writers.

Thank you
Konstantin
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