Comment #1 on issue 537 by [email protected]: document hbal placement
behavior wrt drained nodes
http://code.google.com/p/ganeti/issues/detail?id=537
The htool internal representation of a node has no concept of "drained."
The backends that are aware of the concept of a drained node translate
that state into offline. So, technically, the documentation is correct,
but a sentence like "drained nodes are considered offline in the sense
of hbal (and the other htools)" but help a lot to clarify.
That, together with the description of the metric, would make it clear
that hbal not only doesn't move new instances to drained nodes, but even
actively tries to move instances out of drained nodes.
(So, one way to evacuate a node is to mark it as drained and rebalance
the cluster.)
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