On Wed, Mar 13, 2013 at 09:23:04PM +0000, Jonathan Horne wrote: > I have a virtual machine with a 500GB thin-provisioned disk, and on > it is about 2GB of data. Due to a pvmove operation I am running, > the 500GB disk with 2GB of data is growing and growing and is > currently 180GB in size, and im sure it will go all the way to the > 500GB before it stops. > > When this process is finished, is there a way to re-thin the disk > back down to the proper size again? What about the export/import > process? Would that export it to the data size, not the block size?
There's not a way to do this in-place currently, although we're working on it. If you can accept a copy, then 'qemu-img convert' will automatically sparsify disks, although it only works if there is no left-over data in the blocks. Also requiring a copy, virt-sparsify can fully sparsify a disk even if it has left-over but unused data blocks. See also: http://libguestfs.org/virt-sparsify.1.html http://libguestfs.org/guestfs-faq.1.html#why-doesnt-virt-sparsify-work-on-the-disk-image-in-place- - - - Your question also made me wonder if there was a tool to do an in-place sparsification of a thin provisioned DM device, but there doesn't seem to be anything for that. *If* such a tool did exist, then you could use it in conjunction with the following guestfish command: http://libguestfs.org/guestfish.1.html#zero-free-space ie. something like: guestfish -a /dev/vg/guest ><fs> run ><fs> list-filesystems # for each filesystem do: ><fs> mount /dev/XXX / ><fs> zero-free-space / ><fs> umount / followed by running the non-existent thinning tool. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into KVM guests. http://libguestfs.org/virt-v2v _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users