Hi Bertrand, I solved the problem recovering from old snapshots when possibile (for some VMs i didn't find the LVs on the VG).. I discovered that usually the volume ovirt couldn't get the size, was not resident on the VG. Don't ask me why this happens or when (i'm sure it began on ovirt-3.6 maybe with version 3.6.7, i'm not sure that i had the 3.6.5), i only know that almost all the last snapshots were not resident on the same VG, in some way the machine was running ok up to I shut it down, then no volume anymore. Luckily i could recover the VMs from previous snapshots mounting LVs manually, then with qemu-img convert creating a raw image and the last using dd with netcat to copy on new VMs with the same features (RAM, disk, etc.) of the original VMs. We have about 250 VMs, about 150 have snapshots, I recovered manually about 100 VMs, some from snapshot when clone or export worked, but mostly using the method described. I investigated and discovered that in some way the info on Ovirt-DB were right, but physically on the snapshots were wrong pointing to different VM parent-snapshots or having missing snapshots. If you need some help let me know, but repeat i'm still recovering old VMs, moving them to a new Datacenter. Claudio On 09/11/16 23:19, Bertrand Caplet wrote: -- / | / _____/ / | / _____/ | / / / | / / / / | / / / | / / / | / ___/ _____/ / / | / ___/ / | / / / | / / / / | / / / | / ______/ _/ __/ _/ _/ _/ __/ _/ _/ __/ Claudio Soprano phone: (+39)-06-9403.2349/2355 Computing Service fax: (+39)-06-9403.2649 LNF-INFN e-mail: Claudio.Soprano(a)lnf.infn.it Via Enrico Fermi, 40 www: http://www.lnf.infn.it/ I-00044 Frascati, Italy