Ohh, I see that I haven't sent to the list, so I do that now.... Hi! Ahaa, I can shed some light here... This is a part of the log in engine: 2012-07-15 13:46:51,837 INFO [org.ovirt.engine.core.vdsbroker.vdsbroker.BrokerCommandBase] (http--0.0.0.0-8080-3) Vds: node1.hemma.home 2012-07-15 13:46:51,837 ERROR [org.ovirt.engine.core.vdsbroker.VDSCommandBase] (http--0.0.0.0-8080-3) Command CreateVGVDS execution failed. Exception: VDSErrorException: VDSGenericException: VDSErrorException: Failed in vdscommand to CreateVGVDS, error = Volume Group not big enough: ('VG size must be more than 10240 MiB',) 2012-07-15 13:46:51,837 INFO [org.ovirt.engine.core.vdsbroker.vdsbroker.CreateVGVDSCommand] (http--0.0.0.0-8080-3) FINISH, CreateVGVDSCommand, log id: da915ec 2012-07-15 13:46:51,838 ERROR [org.ovirt.engine.core.bll.storage.AddSANStorageDomainCommand] (http--0.0.0.0-8080-3) Command org.ovirt.engine.core.bll.storage.AddSANStorageDomainCommand throw Vdc Bll exception. With error message VdcBLLException: org.ovirt.engine.core.vdsbroker.vdsbroker.VDSErrorException: VDSGenericException: VDSErrorException: Failed in vdscommand to CreateVGVDS, error = Volume Group not big enough: ('VG size must be more than 10240 MiB',) 2012-07-15 13:46:51,859 INFO [org.ovirt.engine.core.bll.storage.AddSANStorageDomainCommand] (http--0.0.0.0-8080-3) Command [id=db9901fd-9f2d-4298-88d9-70dd898fa4bd]: Compensating NEW_ENTITY_ID of org.ovirt.engine.core.common.businessentities.storage_domain_dynamic; snapshot: ae76ccdb-e920-436c-b623-09d5e3db3acd. 2012-07-15 13:46:51,869 INFO [org.ovirt.engine.core.bll.storage.AddSANStorageDomainCommand] (http--0.0.0.0-8080-3) Command [id=db9901fd-9f2d-4298-88d9-70dd898fa4bd]: Compensating NEW_ENTITY_ID of org.ovirt.engine.core.common.businessentities.storage_domain_static; snapshot: ae76ccdb-e920-436c-b623-09d5e3db3acd. 2012-07-15 13:46:51,890 ERROR [org.ovirt.engine.core.bll.storage.AddSANStorageDomainCommand] (http--0.0.0.0-8080-3) Transaction rolled-back for command: org.ovirt.engine.core.bll.storage.AddSANStorageDomainCommand. 2012-07-15 13:46:52,049 WARN [org.ovirt.engine.core.bll.storage.AttachStorageDomainToPoolCommand] (http--0.0.0.0-8080-3) CanDoAction of action AttachStorageDomainToPool failed. Reasons:VAR__TYPE__STORAGE__DOMAIN,VAR__ACTION__ATTACH,ACTION_TYPE_FAILED_STORAGE_DOMAIN_NOT_EXIST And the important part is that it say`s that "error = Volume Group not big enough: ('VG size must be more than 10240 MiB',)" The LUN I created is a qcow2-LUN of 50 Gb size, which of coarse doesn't have the size of 50 Gb, because it is a thin provisioned LUN. So question is then: Doesn't oVirt support thin provisioned LUN's? If not, it is not very good, because most SAN's provide thin provisioned LUN's nowaday's... This is perhaps a limitation of LVM2? It would be a real setback to not be able to use qcow2, though.... Regards Johan