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https://issues.apache.org/jira/browse/CLOUDSTACK-10310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16483566#comment-16483566
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ASF GitHub Bot commented on CLOUDSTACK-10310:
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wido commented on issue #2472: CLOUDSTACK-10310 Fix KVM reboot on storage issue
URL: https://github.com/apache/cloudstack/pull/2472#issuecomment-390883172
@rhtyd Both cases are not ideal. Because if you stop the Agent due to a
single Primary Storage failure you leave VMs running there which still might be
doing I/O and to start them a second time somewhere else.
The hard reboot isn't a very nice either, so you have to deal with two bad
things.
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> KVM hosts reboot if there is a short transient storage error
> ------------------------------------------------------------
>
> Key: CLOUDSTACK-10310
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-10310
> Project: CloudStack
> Issue Type: Improvement
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: KVM
> Affects Versions: 4.9.0, 4.10.0.0
> Reporter: Sean Lair
> Priority: Major
>
> If the KVM heartbeat file can't be written to, the host is rebooted, and thus
> taking down all VMs running on it. The code does try 5x times before the
> reboot, but the there is not a delay between the retires, so they are 5
> simultaneous retries, which doesn't help. Standard SAN storage HA operations
> or quick network blip could cause this reboot to occur.
> Some discussions on the dev mailing list revealed that some people are just
> commenting out the reboot line in their version of the CloudStack source.
> A better option (and a new PR is being issued) would be have it sleep between
> tries so it isn't 5x almost simultaneous tries. Plus, instead of rebooting,
> the cloudstack-agent could just be stopped on the host instead. This will
> cause alerts to be issued and if the host is disconnected long-enough,
> depending on the HA code in use, VM HA could handle the host failure.
> The built-in reboot of the host seemed drastic
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