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Is there a way to make sar (from sysstat) collect free disk space data?

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No, it can not. My guess on the reason is that it isn't necessarily tied directly to performance, at least not in a way that makes sense in polled intervals.

munin is an example of a tool that will do this, but it writes to RRD files, which can not be in a human readable form from the command line.

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I wonder if there's a way to add a custom measure to the data collected by sar, or would it be better to create a parallel system to collect that? Hmmmm! –  Fadi Mansour Feb 10 '13 at 19:37

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