On Sun, 30 Oct 2016, John Calcote wrote: > Hi all - > > I posted this question to the ceph-user list a few days ago but no one > responded, so I thought I'd send it to the devel list too: > > What happens if I create a pool and associated it with a ruleset (say, > set '2', for instance), and then I remove all the rules from set '2'? > > Similarly, what happens if I add a single rule to ruleset 2 that's > size-constrained to pools of size 2 - 3, but then create a replicated > pool of size 4 using that ruleset? > > Is there a fundamental rule that ceph uses (e.g., random selection) to > choose osds on which to store the replicas? 1- Ceph mon's should prevent you from removing the rule. If not, that's a usability bug. 2- If you somehow get to the point where there is no rule, the PGs map to an empty set of OSDs, and they'll probably just show up as 'stale' + something or inactive until you fix the pool to point to a valid crush rule. 3- Most of the rule "set" logic has been deprecated/streamlined so that for new clusters and new rules there is only one rule per ruleset and the ids match up. sage -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
