[ovirt-users] Is this kind of VM replication possible using oVirt Schedular

[Gilad Chaplik]

Hi Kausik,

If I understand correctly your question, we do support this flow.
In case of failure we migrate highly available VMs to other hosts, but note that there could be a connectivity problem between engine an node, and node can still communicate with the storage,
so to avoid that (split brain) you need to have PM configured for that node, or manually confirm that the host has rebooted.

We even added a feature lately (3.4's HA reservation [1]) that indicates whether your HA VMs have enough resources in cluster in case of a node failure.

Thanks, 
Gilad.

[1] http://www.ovirt.org/Features/HA_VM_reservation

----- Original Message -----
> From: "kausik pal" <kausikpal.1 at gmail.com>
> To: users at ovirt.org
> Sent: Tuesday, June 24, 2014 8:06:10 PM
> Subject: [ovirt-users] Is this kind of VM replication possible using oVirt	Schedular
> 
> Hi All,
> 
> PFA the two diagrams describing placement of the VMs during normal condition
> and condition after two node failure in 5 node set up (Each Node can host up
> to 6 VMs due to memory constraints).
> 
> My question is whether this kind of VM replication as shown in the attached
> diagram is possible utilizing oVirt schedular.
> 
> The benefits of this kind of replication would be following :-
> 
> 1. Any number of Hosts/Nodes can participate (Odd/Even) in the
> infrastructure.
> 
> 2. We can add any number (odd/even) number of Nodes to re-balance the VM
> placement.
> 
> 3. After node failures the Maximum number of VMs that can run on the
> remaining nodes can be calculated with the following formula:-
> 
> Total No. of VMs running after node failure = ((Total No. of Nodes) - (No. of
> failed Nodes)) * (Max. No. of VMs that can run per Node)
> 
> The attached table gives a rough calculation on maximum number VMs that can
> run after node failures.
> 
> 
> Please let me know if you need any further information from my side.
> 
> Thanks
> 
> Kausik
> 
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