[ovirt-users] Unable to change compatibility version due to hosted engine

[Renout Gerrits]

Hi All,

We have an environment which we want to upgrade to ovirt 4.0. This was
initially installed at 3.5, then upgraded to 3.6.
Problem we're facing is that for an upgrade to 4.0 a compatibility version
of 3.6 is required.
When changing the cluster compatibility version of the 'Default' cluster
from 3.5 to 3.6 we get the error in the gui: "Cannot change cluster
compatibility version when a VM is active. please shutdown all VMs in the
cluster."
Even when we shutdown all vm's, except for the Hosted Engine we get this
error.
On the hosts a 'vdsClient -s 0 list' is done which will return the HE.
In the engine logs we have the following error: "2016-12-08 13:00:18,139
WARN  [org.ovirt.engine.core.bll.storage.UpdateStoragePoolCommand] (default
task-25) [77a50037] CanDoAction of action 'UpdateStoragePool' failed for
user admin at internal. Reasons:
VAR__TYPE__STORAGE__POOL,VAR__ACTION__UPDATE,$ClustersList
Default,ERROR_CANNOT_UPDATE_STORAGE_POOL_COMPATIBILITY_VERSION_BIGGER_THAN_CLUSTERS"

So problem would be that the HE is in the Default cluster. But how does one
change the compatibility version when the HE is down?
I've tried shutting down the engine, changing the version in the DB:
"UPDATE vds_groups SET compatibility_version='3.6';" and starting the
engine again.

When I do that and try to start a VM:
2016-12-09T13:30:21.346740Z qemu-kvm: warning: CPU(s) not present in any
NUMA nodes: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
2016-12-09T13:30:21.346883Z qemu-kvm: warning: All CPU(s) up to maxcpus
should be described in NUMA config
2016-12-09T13:30:21.355699Z qemu-kvm: "-memory 'slots|maxmem'" is not
supported by: rhel6.5.0

So that change was rolled back to compatibilty 3.5. After that we we're
able to start vm's again.
Please note that all hosts and HE are EL7.

To me this doesn't seem like a strange set-up or upgrade path. Would it be
possible to start the HE in another cluster than Default or is there a way
to bypass the vdsClient list check?
What is the recommended way of upgrading the HE in this case?

Kind regards,
Renout
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