Description of problem:
Until oVirt 3.4 the Storage Pool (Data Center) information was maintained in the engine database and stored in different ways in the Master Domain. In the larger scope of removing the SPM (Storage Pool Manager) and the Master Domain Role, the goal of this feature is to decommission the Storage Pool Metadata (and its dependency on the Master Domain) .
More details at:
Moving to 3.5 as did not meet the 3.4 feature freeze
oVirt 3.5 has been released and should include the fix for this issue.