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