On Mon, Jul 23, 2018 at 7:48 PM <stuartk@alleninstitute.org> wrote:
I've been reading through documentation https://www.ovirt.org/documentation/architecture/architecture/ https://www.ovirt.org/documentation/self-hosted/Self-Hosted_Engine_Guide/
But am struggling still to understand the role ovirt-engine plays. Would anyone have recommends for additional reads?
The problem I'm tackling currently looks like this: - We have (2) oVirt Data Centers, each populated by a single Cluster. The Data Centers are physically & network-wise 'distant' from one another - hosted-engine runs on (3) of the (4) Hosts in Data Center A / Cluster A. hosted-engine does not run on Data Center B / Cluster B - When we disrupt network connectivity around Cluster A (yes, that's Cluster *A*), Hosts in Cluster B crash (requiring a power cycle) and Guests in Cluster B get stopped and paused
I'm struggling to understand why mussing with Cluster A affects Cluster B. From pcaps, I can see plenty of TLS traffic from Cluster A's Hosts -- presumably from ovirt-engine running on Cluster A -- exchanged with Cluster B. So, during my last maintenance window, I put hosted-engine into maintenance mode ... but Hosts/VMs in Cluster B were still affected.
The engine is the brain of your system, it's a kind of orchestrator that starts different tasks on your hosts. You need an engine for new tasks but existing tasks such as running a VM should not be affected at all by the lack of an engine. I fear that your issue is somewhere else. what do you exactly mean with "Hosts in Cluster B crash "? are you sure that your hosts in data center B are not consuming storage exposed by hosts in data center A?
Where do I go to better understand what ovirt-engine does when it is 'managing' Hosts & VMs?
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