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https://issues.apache.org/jira/browse/CLOUDSTACK-7184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14128253#comment-14128253
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Remi Bergsma commented on CLOUDSTACK-7184:
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+1!
> HA should wait for at least 'xen.heartbeat.interval' sec before starting HA
> on vm's when host is marked down
> ------------------------------------------------------------------------------------------------------------
>
> Key: CLOUDSTACK-7184
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-7184
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: Hypervisor Controller, Management Server, XenServer
> Affects Versions: 4.3.0, 4.4.0, 4.5.0
> Environment: CloudStack 4.3 with XenServer 6.2 hypervisors
> Reporter: Remi Bergsma
> Assignee: Daan Hoogland
> Priority: Blocker
>
> Hypervisor got isolated for 30 seconds due to a network issue. CloudStack did
> discover this and marked the host as down, and immediately started HA. Just
> 18 seconds later the hypervisor returned and we ended up with 5 vm's that
> were running on two hypervisors at the same time.
> This, of course, resulted in file system corruption and the loss of the vm's.
> One side of the story is why XenServer allowed this to happen (will not
> bother you with this one). The CloudStack side of the story: HA should only
> start after at least xen.heartbeat.interval seconds. If the host is down long
> enough, the Xen heartbeat script will fence the hypervisor and prevent
> corruption. If it is not down long enough, nothing should happen.
> Logs (short):
> 2014-07-25 05:03:28,596 WARN [c.c.a.m.DirectAgentAttache]
> (DirectAgent-122:ctx-690badc5) Unable to get current status on 505(mccpvmXX)
> .....
> 2014-07-25 05:03:31,920 ERROR [c.c.a.m.AgentManagerImpl]
> (AgentTaskPool-10:ctx-11b9af3e) Host is down: 505-mccpvmXX. Starting HA on
> the VMs
> .....
> 2014-07-25 05:03:49,655 DEBUG [c.c.h.Status] (ClusteredAgentManager
> Timer:ctx-0e00979c) Transition:[Resource state = Enabled, Agent event =
> AgentDisconnected, Host id = 505, name = mccpvmXX]
> cs marks host down: 2014-07-25 05:03:31,920
> cs marks host up: 2014-07-25 05:03:49,655
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