Hi, This is along the lines of "tools for sysadmins". I plan on using these algorithms for puppet-gluster, but will try to maintain them separately as a standalone tool. The problem: Given a set of bricks and servers, if they have a logical naming convention, can an algorithm decide the ideal order. This could allow parameters such as replica count, and chained=true/false/offset#. The second problem: Given a set of bricks in a volume, if someone adds X bricks and removes Y bricks, is this valid, and what is the valid sequence of add/remove brick commands. I've written some code with test cases to try and figure this all out. I've left out a lot of corner cases, but the boilerplate is there to make it happen. Hopefully it's self explanatory. (gluster.py) Read and run it. Once this all works, the puppet-gluster use case is magic. It will be able to take care of these operations for you (if you want). For non puppet users, this will give admins the confidence to know what commands they should _probably_ run in what order. I say probably because we assume that if there's an error, they'll stop and inspect first. I haven't yet tried to implement the chained cases, or anything involving striping. There are also some corner cases with some of the current code. Once you add chaining and striping, etc, I realized it was time to step back and ask for help :) I hope this all makes sense. Comments, code, test cases are appreciated! Cheers, James @purpleidea (irc/twitter) https://ttboj.wordpress.com/ -------------- next part -------------- A non-text attachment was scrubbed... Name: gluster.py Type: text/x-python Size: 16085 bytes Desc: not available URL: <http://supercolony.gluster.org/pipermail/gluster-users/attachments/20131127/27311df2/attachment.py>
