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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-8628) Ceph RBD only cluster with KVM does not fence properly
Date Thu, 16 Jul 2015 16:42:05 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-8628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14629980#comment-14629980
] 

ASF GitHub Bot commented on CLOUDSTACK-8628:
--------------------------------------------

Github user wilderrodrigues commented on the pull request:

    https://github.com/apache/cloudstack/pull/580#issuecomment-122015786
  
    Travis failed due to NPE:
    
    Tests in error: 
      KVMFencerTest.testWithFailingFence:135 » NullPointer
      KVMFencerTest.testWithSingleHost:75 » NullPointer
      KVMFencerTest.testWithSingleHostDown:88 » NullPointer
      KVMFencerTest.testWithTimeoutingFence:158 » NullPointer


> 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
>             Fix For: Future, 4.6.0
>
>
> 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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