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https://issues.apache.org/jira/browse/CLOUDSTACK-10310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16668418#comment-16668418
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ASF GitHub Bot commented on CLOUDSTACK-10310:
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PaulAngus commented on issue #2722: CLOUDSTACK-10310 Fix KVM reboot on storage
issue
URL: https://github.com/apache/cloudstack/pull/2722#issuecomment-434230839
IMHO i'd say if a VM on that storage is marked as ha-enabled, it should be
powered-off and restarted somewhere else, and if it isn't HA enabled, we
shouldn't do anything with the running VM (as it's for the user of the VM to
deal with it),
in either case we should probably set the host to 'alert' so then an admin
can see it and do something about it.
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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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