Hello,
As part of the python-crush project, I am working on a feature to calculate the available usable space in the pools of a cluster. The idea is to make an accurate and conservative estimate that takes into account the exact PG mappings as well as any other information that could help quantify the variance of data placement ahead of time. To my knowledge, this is not what the current "ceph df" command does.http://libcrush.org/xvillaneau/crush-docs/raw/v0.1.0/converted/Ceph%20pool%20capacity%20analysis.pdf
Any comment, correction or review is welcome. Additionally, if there are other common pool usage scenarios that could be covered, I will gladly add them in.
Best Regards,
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Xavier Villaneau
Won't solve clusters filling up too fast, but at least you'll know.
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