> Interesting bug. I think I agree with you that there isn't a good solution > currently for instances that have a mix of shared and not-shared storage. > > I'm curious what Daniel meant by saying that marking the disk shareable is > not > as reliable as we would want. I think this is the bug I reported here: https://bugs.launchpad.net/nova/+bug/1376615 My initial approach was indeed to mark the disks are shareable: the patch (https://review.openstack.org/#/c/125616/) has comments around the issues, mainly around I/Ocache and SELinux isolation being disabled. -- Thomas