Question #675575 on Graphite changed:
https://answers.launchpad.net/graphite/+question/675575
Status: Open => Answered
Denis Zhdanov proposed the following answer:
Whisper (Graphite data storage format) was designed to have predictable disk
usage.
So, retentions = 60s:1d means that Graphite will store datapoint for every 60
seconds and it will keep it for 1 day. It will not drop anything after 1 day,
it will just update old points with new data, so, file size will be the same,
but if you request more then 1 day of data you will get nothing.
So, if you was able to see the historical data before means that files before
was created using different retention, not 60s:1d. I do not see any other
explanation, so, probably retention was changed recently.
If you using retention 10s:14d, then it will store 1 datapoint every 10 seconds
and it will keep data for 14 days, indeed. If you change 10s to 1s then file
will be 10 times bigger.
Please check Whisper documentation for details -
https://graphite.readthedocs.io/en/latest/whisper.html
You can use multiple archives if you want to balance file size and data
retention, e.g.
retention = 10s:1d,60s:7d,5m:1y
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