Yes, it seems fallocate on ZFS is problematic: https://github.com/zfsonlinux/zfs/issues/326
With that in mind, the right answer for ZFS is probably for virt-manager /virt-install to NOT ask for any preallocation at all in the ZFS case. The fun of course is how does virt-manager know whether the image it is about to create is on ZFS or not. This might point to an RFE for storage pools to report whether a given storage pool instance is capable of efficiently preallocating or not. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1847105 Title: very slow disk creation, snapshotting To manage notifications about this bug go to: https://bugs.launchpad.net/virt-manager/+bug/1847105/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
