Description of problem: Since ISOs can now reside on data domains rather than only on a designated ISO domains, moving a storage domain to maintenance should be forbidden in case the domain contains ISO images that are connected to running VMs
verified on engine 4.2.2-0.1. Snippet from engine log - should '$VmNames' be there? 2018-02-19 14:50:22,960+02 WARN [org.ovirt.engine.core.bll.storage.domain.DeactivateStorageDomainWithOvfUpdateCommand] (default task-20) [76fc633c-9879-47b4-96bf-437553219fe1] Validation of action 'DeactivateSt orageDomainWithOvfUpdate' failed for user admin@internal-authz. Reasons: VAR__TYPE__STORAGE__DOMAIN,VAR__ACTION__DEACTIVATE,ERROR_CANNOT_DEACTIVATE_STORAGE_DOMAIN_WITH_ISO_ATTACHED,$VmNames vm1
This bugzilla is included in oVirt 4.2.1 release, published on Feb 12th 2018. Since the problem described in this bug report should be resolved in oVirt 4.2.1 release, it has been closed with a resolution of CURRENT RELEASE. If the solution does not work for you, please open a new bug report.