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From "Wido den Hollander (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CLOUDSTACK-8628) Ceph RBD only cluster with KVM does not fence properly
Date Mon, 13 Jul 2015 20:47:05 GMT
Wido den Hollander created CLOUDSTACK-8628:
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             Summary: Ceph RBD only cluster with KVM does not fence properly
                 Key: CLOUDSTACK-8628
                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-8628
             Project: CloudStack
          Issue Type: Bug
      Security Level: Public (Anyone can view this level - this is the default.)
            Reporter: Wido den Hollander
            Assignee: Wido den Hollander


When a NFS storage pool is present on a KVM cluster that pool is used for writing heartbeats
to.

In case of a Ceph (RBD) only cluster such pools are not available and thus the KVM hosts do
not write any heartbeats.

Should the KVM Agent crash for any reason they will be fenced of directly and this will cause
a split-brain situation.

Fencing should not happen when no NFS storage pool is present as it is dangerous for data
consistency. A Instance could be running on two hosts at the same time.



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