>From the docs for each project: "When a primary storage outage occurs the hypervisor immediately stops all VMs stored on that storage device"http://docs.cloudstack.apache.org/projects/cloudstack-administration/en/4.8/reliability.html
"CloudStack will only bind to one monitor (You can however create a Round Robin DNS record over multiple monitors)"http://docs.ceph.com/docs/master/rbd/rbd-cloudstack/ Doesn't this mean that if the CEPH monitor cloudstack chooses to bind to goes down all your VMs stop? If so, that seems pretty risky. RRDNS is for poor man's load balancing, not HA. I guess it depends on when Cloudstack does DNS lookup and if there's some minimum unavailable delay before it flags primary storage as offline, but it seems like substituting RRDNS for whatever CEPH's internal "find an available monitor" algorithm is is a bad idea. -- Adam Carheden
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