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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (CLOUDSTACK-8628) Ceph RBD only cluster with KVM does not fence properly
Date Thu, 16 Jul 2015 14:03:04 GMT


ASF GitHub Bot commented on CLOUDSTACK-8628:

Github user wilderrodrigues commented on the pull request:
    @wido any news on this PR?

> Ceph RBD only cluster with KVM does not fence properly
> ------------------------------------------------------
>                 Key: CLOUDSTACK-8628
>                 URL:
>             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
> 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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