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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-10310) KVM hosts reboot if there is a short transient storage error
Date Mon, 08 Oct 2018 15:06:00 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-10310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16641975#comment-16641975
] 

ASF GitHub Bot commented on CLOUDSTACK-10310:
---------------------------------------------

csquire edited a comment on issue #2722: CLOUDSTACK-10310 Fix KVM reboot on storage issue
URL: https://github.com/apache/cloudstack/pull/2722#issuecomment-427867205
 
 
   Sorry, I misspoke in my last comment (edited to make it correct). The blocked host doesn't
reboot, it just gets marked as `Down` and the VMs are actually still running on it when duplicate
VMs get provisioned. Maybe it's a completely separate issue, but will still prevent us from
using 4.11 in production. EDIT: Actually, looks like it may have been present before 4.11.

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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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