The answer to this question is probably obvious, but I couldn't figure out what it means nor find the documentation for it. When I run rrdtool info, I get ds[source].unknown_sec = 0, and I am not sure what it exactly means...Any help or pointers would be appreciated!
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Actually, I think I figured out what it means. If two data samples exceed the heartbeat value, then the entire interval between the two data samples are marked as unknown. So unknown_sec = 0 means there hasn't been two data samples that exceed the heartbeat value.
jkim796
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The unknown_sec is the number of seconds for which the value of the DS is Unknown. This could be because the supplied value was Unknown, or was outside the specified range, or because the time since the last sample exceeds the heartbeat time (which marks everything since then as Unknown).
The amount of Unknown time in an interval is then used in combination with the xff fraction in the RRA definitions to determine if a consolodated data point stored in the RRA is Unknown.
Steve Shipway
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