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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (CLOUDSTACK-10310) KVM hosts reboot if there is a short transient storage error
Date Fri, 09 Mar 2018 14:26:00 GMT


ASF GitHub Bot commented on CLOUDSTACK-10310:

wido commented on issue #2472: CLOUDSTACK-10310 Fix KVM reboot on storage issue
   Can VM HA handle such a failure? Let's say you have two NFS mounts on that host and once
fails. You only stop the Agent, but other VMs keep running.
   Afaik that can still cause a corruption where a VM is spawned twice in a cluster because
the other host can't know if that VM is still running or not.
   Our investigators aren't that smart. They rely on ICMP and such which might be blocked.

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> KVM hosts reboot if there is a short transient storage error
> ------------------------------------------------------------
>                 Key: CLOUDSTACK-10310
>                 URL:
>             Project: CloudStack
>          Issue Type: Improvement
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: KVM
>    Affects Versions: 4.9.0,
>            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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