Github user ProjectMoon commented on the pull request:
https://github.com/apache/cloudstack/pull/1406#issuecomment-182452345
Tests were performed using a running environment. Deploy a zone, then
delete the hosts in the zone and make sure there are no system VMs remaining.
Wait for the cleanup thread to run. Without this fix, the volumes will not be
deleted and it will log errors about missing endpoints/SSVM being down. With
it, the volumes will be expunged. The zone cannot be deleted otherwise.
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