A few years ago, I gave this talk at LCA which covers a lot of these details.
https://www.youtube.com/watch?v=_sUvfGKhaMo&list=PLIr7I80Leee5NpoYTd9ffNvWq0pG18CN3&index=9 --John On 27 Jun 2016, at 17:36, Mark Kirkwood wrote: > Hi, > > I'm in the process of documenting failure modes (for ops documentation etc). > Now I think I understand the intent: > > - swift tries to ensure you always have the number of configured replicas > > In the case of missing or unmounted devices I'm seeing the expected behaviour > i.e: > > - new object creation results in the configured number of replicas (some > stored on handoff nodes) > - existing objects replicated on handoff to produce the correct replica number > > In the case of a node (or a region) I'm *not* seeing analogous behaviour for > *existing* objects, i.e I am a replica down after shutting down on of my > nodes and waiting a while. > > I am testing using swift 2.7.on a small cluster of vms (4 nodes, 4 devices, 2 > regions) - now it may be that my setup is just too trivial (or maybe I > haven't waited long enough for swift decide my storage node is really down). > Any thoughts? I'd like to understand precisely what is supposed to happen > when a node (and also an entire region) is unavailable. > > Cheers > > Mark > > _______________________________________________ > Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > Post to : openstack@lists.openstack.org > Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
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