Hello all,
A few weeks ago Loïc Dachary presented his work on python-crush to the ceph-devel list, but I
don't think it's been done here yet. In a few words, python-crush is a
new Python 2 and 3 library / API for the CRUSH algorithm. It also
provides a CLI executable with a few built-in tools related to CRUSH
maps. If you want to try it, follow the instructions from its
documentation page: http://crush.readthedocs.io/en/latest/
- analyze: Get a estimation of how (un)evenly the objects will be placed into your cluster
Both
these tools are very basic and have a few known caveats. But nothing
that cannot be fixed, the project is still young and open to suggestions
and contributions.
This
is where we'd like
to hear from the users' community feedback, given everyone's experience
in operating (or just messing around with) Ceph clusters. What kind of
CRUSH / data placement tools would be interesting to have? Are there
some very common architectural / technical questions related to CRUSH
that such tools would help answering? Any specific cases where such a
thing could have spared you some pain?
Here a few ideas on top of my head, to help with starting the discussion:
- Static analysis of the failure domains, with detection of potential SPOFs
- Help to capacity planning, estimations of how much data could practically be stored in a cluster
- Built-in basic scenarios for "compare" such as adding a node or removing an OSD.
Please share your ideas, those will eventually help making a better tool!
Regards,
--
--
Xavier Villaneau
Software Engineer, working with Ceph during day and sometimes at night too.
Storage R&D at Concurrent Computer Corporation, Atlanta USA
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