Hi -   We want to migrate our aging oVirt cluster to a new one and decided to go for the hyperconverged setup with Gluster and hosted engine. Got 3 new machines, set everything up, did a test VM migration and were almost ready to do final migration of our VMs when I notice one really weird thing.  When migrating VMs from NFS storage onto Gluster they stay thin provisioned. But if I try creating new disk image from the oVirt GUI - I get  preallocated volume. No matter if I select "thin provision" or "Preallocated" I always get preallocated volume created.  The engine.log says -  2019-05-07 17:14:20,562-04 INFO  [org.ovirt.engine.core.vdsbroker.irsbroker.CreateImageVDSCommand] (default task-20) [bbd94792-2f86-44eb-9334-807dd44d0742] START, CreateImageVDSCommand( CreateImageVDSCommandParameters:{storagePoolId='43550c2c-7100-11e9-9b45-00163e4babb7', ignoreFailoverLimit='false', storageDomainId='1de2f7ac-ee52-43fb-89ac-f86b62f73b9a', imageGroupId='86c5c5e9-6533-4caf-a5a5-401556a5059a', imageSizeInBytes='21474836480', volumeFormat='RAW', newImageId='470b8035-9380-408d-a644-96e8d74c4e8e', imageType='Preallocated', newImageDescription='{"DiskAlias":"test","DiskDescription":""}', imageInitialSizeInBytes='0'}), log id: 228ddfd5 Is there any tweak I didn't notice to make things actually what it suppose to be doing? oVirt 4.3.3.5-1.el7 glusterfs 5.5-1.el7 CentOS Linux release 7.6.1810 Thank you! -- Dmitry Filonov Linux Administrator SBGrid Core | Harvard Medical School 250 Longwood Ave, SGM-114 Boston, MA 02115