We recently upgrade to luminous (you can see the device-classes in the output).
So it should be possible to have one single root, no fake hosts and just use
the device-class.
We added some hosts/osds recently which back a new pools, so we also created a
new hierarchy and crush rules for those. That worked perfect, and of course we
want to have that for the old parts of the cluster, too
Is it possible to move the existing osd's to a new root/bucket without having
to move all the data around (which might be difficult cause we don't have
enough capacity to move 50 % of the osd's ) ?
I imagine something like:
1. Magic maintenance command
2. Move osds to new bucket in hierarchy
3. Update either existing crush-rule or create new rule an update pool
4. Magic maintenance-done command
We also plan to migrate the ods to bluestore. Should we do this
a) before moving
b) after moving
I hope our issue is clear.
Best regards
Carsten
You don't need "magic maintenance command", when you online apply your
crush rule you need to move your osds to root defined in new crush rule.
Data movement is not huge in this case.
k
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