Some thoughts on enhancing High Availability in oVirt

[Itamar Heim]

On 02/14/2012 06:31 PM, Adam Litke wrote:
> On Thu, Feb 09, 2012 at 11:45:09AM -0500, Perry Myers wrote:
>> warning: tl;dr
>>
>> Right now, HA in oVirt is limited to VM level granularity.  Each VM
>> provides a heartbeat through vdsm back to the oVirt Engine.  If that
>> heartbeat is lost, the VM is terminated and (if the user has configured
>> it) the VM is relaunched.  If the host running that VM has lost its
>> heartbeat, the host is fenced (via a remote power operation) and all HA
>> VMs are restarted on an alternate host.
>>
>
> Has anyone considered how live snapshots and live block copy will intersect HA
> to provide a better end-user experience?  For example, will we be able to handle
> a storage connection failure without power-cycling VMs by migrating storage to a
> failover storage domain and/or live-migrating the VM to a host with functioning
> storage connections?

cc'ing Dor - iirc, he mentioned an issue with live migrating a guest 
post an IO error