Hi! Ah, sorry, I should have been more precise in my qestion. Osinfo was somehow damaget on our side, I'm sure. I mean the UI problem. This one:
The problem actually looks somewhat related to UI. I've tried to _not_ change anything on "Edit Cluster" dialogue window and just pressed "OK" and still got the "Error while executing action: Cannot disable gluster service on the cluster as it contains volumes" response. By looking on UI I see that "Enable Gluster Service" checkbox is empty and is grayed out. Looks like UI "thinks" that Glusterfs is disabled and when I hit "OK" it tries to apply this as a change.
I've checked engine-config:
[root@he ~]# engine-config -g AllowClusterWithVirtGlusterEnabled Picked up JAVA_TOOL_OPTIONS: -Dcom.redhat.fips=false AllowClusterWithVirtGlusterEnabled: true version: general
It is "True". And it is protected. I was unable to set it to "False" - just tried out of curiosity.
Next I've opened Web Developer Tools in my browser, found '<input type="checkbox" value="on" id="ClusterPopupView_enableGlusterService" tabindex="17" disabled="" style="vertical-align: top;">' and removed the word 'disabled'. I've checked this checkbox and tried hitting "OK".
This time the dialog worked and after reopening it I see the checkbox grayed out but now it is checked. oVirt works, nothing is changed or ruined. But one more observation: this checkbox stays checked till Hosted Engine reboot. After a reboot it is unchecked again.