[ClusterLabs] XenServer guest and host watchdog

[Klaus Wenninger]

On 09/08/2017 02:57 PM, Mark Syms wrote:
>
> Hi Klaus,
>
>  
>
> Good to meet you and everyone else at the summit.
>
>  
>
> As we discussed regarding the handling of watchdog in XenServer, both
> guest and host, I’ve had a discussion with our subject matter expert
> (Andrew, cc’d) on this topic. The guest watchdogs are handled by a
> hardware timer in the hypervisor but if the timers themselves are not
> serviced within 5 seconds the host watchdog will fire and pull the
> host down.
>

Thank you for the info and the feedback/input on sbd you gave me on the
summit.

Regards,
Klaus

>  
>
> Hopefully this allays your concerns regarding the robustness of the
> watchdog process for the guest VMs on a XenServer environment?
>
>  
>
> Note – whilst the upstream, community supported Xen project has the
> same code for this process it is not enabled by default whereas it is
> in the Citrix packaged and supported version.
>
>  
>
> If you need any further clarification please ask and hopefully we can
> give you the detail you require.
>
>  
>
> Looking forward to working with you and the community on the
> clustering components as we integrate them with XenServer.
>
>  
>
> Regards,
>
>  
>
>                 Mark.
>

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