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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 04:51:04 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-8628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14629175#comment-14629175
] 

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

Github user bhaisaab commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/580#discussion_r34755639
  
    --- Diff: plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/wrapper/LibvirtFenceCommandWrapper.java
---
    @@ -48,6 +48,18 @@ public Answer execute(final FenceCommand command, final LibvirtComputingResource
             final KVMHAMonitor monitor = libvirtComputingResource.getMonitor();
     
             final List<NfsStoragePool> pools = monitor.getStoragePools();
    +
    +        /**
    +         * We can only safely fence off hosts when we use NFS
    +         * On NFS primary storage pools hosts continuesly write
    +         * a heartbeat. Disable Fencing Off for hosts without NFS
    +         */
    +        if (pools.size() == 0) {
    +            String logline = "No NFS storage pools found. No way to safely fence " +
command.getVmName() + " on host " + command.getHostGuid();
    --- End diff --
    
    maybe add an alert for admin here, _alertMgr.sendAlert?


> 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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