On Tue, Feb 14, 2017 at 12:07 AM, Gianluca Cecchi <gianluca.cec...@gmail.com > wrote:
> Hello, > I'm on 4.1 with 2 FC SAN storage domains and testing live migration of > disk. > > I started with a CentOS 7.3 VM with a thin provisioned disk of 30Gb. > It seems that I can see actual disk size in VM--> Snapshots--> Active VM > line and the right sub pane. > If I remember correctly before the live storage migration the actual size > was 16Gb. > But after the migration it shows actual size greater than virtual (33Gb)?? > Hi Gianluca, This is possible for thin disks. With thin disk we have some overhead for qcow2 metadata, which can be up to 10% in the worst case. So when doing operations on thin disk, we may enlarge it to the virtual size * 1.1, which is 33G for 30G disk. Can you share the output of this commands? (If the vm is running, you should skip the lvchange commands) lvchange -ay 5ed04196-87f1-480e-9fee-9dd450a3b53b/9af3574d-dc83-485f-b906- 0970ad09b660he qemu-img check /dev/5ed04196-87f1-480e-9fee-9dd450a3b53b/ 9af3574d-dc83-485f-b906-0970ad09b660he lvchange -an 5ed04196-87f1-480e-9fee-9dd450a3b53b/9af3574d-dc83-485f-b906- 0970ad09b660he Nir > There are no snapshots on the VM right now. > Is this true? In case could it depend on temporary snapshots done by th > esystem for storage migration? But in this case does it mean that a live > merge generates a biggest image at the end..? > > The command I saw during conversion was: > > vdsm 17197 2707 3 22:39 ? 00:00:01 /usr/bin/qemu-img convert > -p -t none -T none -f qcow2 /rhev/data-center/mnt/blockSD/ > 922b5269-ab56-4c4d-838f-49d33427e2ab/images/6af3dfe5- > 6da7-48e3-9eb0-1e9596aca9d3/9af3574d-dc83-485f-b906-0970ad09b660 -O qcow2 > -o compat=1.1 /rhev/data-center/mnt/blockSD/5ed04196-87f1-480e-9fee- > 9dd450a3b53b/images/6af3dfe5-6da7-48e3-9eb0-1e9596aca9d3/ > 9af3574d-dc83-485f-b906-0970ad09b660he > > See currenti situation here: > https://drive.google.com/file/d/0BwoPbcrMv8mvMnhib2NCQlJfRVE/ > view?usp=sharing > > thanks for clarification, > Gianluca > > _______________________________________________ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > >
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