Il giorno mar 27 nov 2018 alle ore 18:45 Eric Blake <eblake@xxxxxxxxxx> ha scritto: > > On 11/27/18 9:23 AM, Joachim Wagner wrote: > >>>> Moreover, I created a QCOW3 disk image. I asked for a maximum capacity > >>>> of 6GB and initial allocation of 0GB (zero). > >>>> I got a 6GB image file. Is this a bug or am I missing something? > >> > >> Any hint on this? > >> With QCOW2 I used to get a 200KB file as initial image, no matter it's > >> maximum size. > > > > Have you checked the space used on disk or the file size? Possibly, the > > default on your system is to use sparse pre-allocation when supported by the > > filesystem. Also, did you try preallocation=off or metadata (see man page)? > > > > How do you request qcow3? According to the edit history of https:// > > wiki.qemu.org/Features/Qcow3 , qcow3 should be many years old but the manpage > > of qemu-img on my current system does not mention qcow3. > > You probably mean qcow2v3. It is also spelled as 'qemu-img create -o > compat=1.1' (newer qemu-img also recognizes the spelling compat=v3), as > opposed to the older 'qemu-img create -o compat=0.10' or v2 images. But > if the virt-manager gui is specifically calling it qcow3, rather than > qcow2v3, then that's a needless confusion that we should fix in the gui. Hi. I relied on the "file" tool provided by Archlinux. It says "QCOW3" as the file type by its contents. So I have manually created another storage image file by command line with: qemu-img create -f qcow2 ./windows2008-d1.qcow 250G The other image file (the sparse one) has been created by virt-manager/libvirt. Then I have run these commands: ~ ls -l total 2,9G drwxrwx--- 2 vmanager vmanager 62 2018-11-27 13:14:36 . drwxr-xr-x 7 vmanager vmanager 152 2018-11-26 12:47:06 .. -rw-rw---- 1 libvirt-qemu kvm 6,1G 2018-11-28 09:19:22 ubuntu18.04 -rw-rw---- 1 libvirt-qemu kvm 196K 2018-11-27 13:14:36 windows2008-d1.qcow [root@host01 /home/vmanager/storage] file * ubuntu18.04: QEMU QCOW Image (v3), 6442450944 bytes windows2008-d1.qcow: QEMU QCOW Image (v3), 268435456000 bytes ~ du * 3015704 ubuntu18.04 196 windows2008-d1.qcow Both files have the same type but while "ubuntu18.04" is clearly a sparse file, "windows2008-d1.qcow" is not. I doesn't make any real difference. It just puzzles me. -- Vincenzo Romano - NotOrAnd.IT Information Technologies -- NON QVIETIS MARIBVS NAVTA PERITVS _______________________________________________ virt-tools-list mailing list virt-tools-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/virt-tools-list
