Just figured it out...an nfs domain used for testing early on is dying/dead.  Putting it into maintenance resolved the flakiness.  It was still around because it housed the iso domain.  Thanks for the offer to help!

Jason

On 11/14/18 12:53 PM, Kaustav Majumder wrote:
Hi, 
Please send the engine log as well as vdsm log of host ovirt1.


On Wed, Nov 14, 2018 at 10:36 PM Jason P. Thomas <jthomasp@gmualumni.org> wrote:
I've got a 4 node cluster running oVirt 4.2.7.  3 hosts are
hyperconverged with glusterfs.  Engine is running on one of the gluster
volumes.  Since yesterday, the cluster is completely unstable and will
not reliably run VMs including the Engine.  A notification will pop up
in the WebUI stating "Finished invoking activate on host ovirt1" while
the task list indicates "Activating host ovirt1".  When this task
ultimately fails, the node in question goes NonOperational.  All our VMs
have been down since 3pm yesterday, so help is greatly appreciated.

Sincerely,
Jason
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Thanks,
Kaustav