Re: [ovirt-users] Is this kind of VM replication possible using oVirt Schedular
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(a)gmail.com>
To: users(a)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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