Description of problem: after triggering the snapshot and then shuting down the VM the engine tried to delete the images it created for the memory, but the delete image tasks are not clear and then no it's impossible to remove the storage or move the host to maintenance.
http://gerrit.ovirt.org/gitweb?p=ovirt-engine.git;a=commit;h=5b706c05c5b5ffc24a21707292bb5ed714b0d04c
why move a bug to ON_QA when it has been released it? IS18 will only be released on wed to QA. if you verified it in IS17, please mark it as fixed in IS17 which was released.
tested in is18
Closing - RHEV 3.3 Released