On Thu, Nov 2, 2023 at 5:13β―PM Fangge Jin <f...@redhat.com> wrote:
> Hi guysπ β
>
> Recently, I found that the disk size of qcow2 image get bigger(from 6.16G
> to 8G in my test) after blockcopy.π βπ β
>
Sorry, it should be "from 6.16G to 6.64G in my test"here
> I'm not sure whether this is normal or not. Please help to check. Thanks.
> π βπ β
>
> BR,π β
> Fangge Jinπ β
>
> Before blockcopy, check source image:π β
> # qemu-img info -U
> /var/lib/avocado/data/avocado-vt/images/jeos-27-x86_64.qcow2π β
> image: /var/lib/avocado/data/avocado-vt/images/jeos-27-x86_64.qcow2π β
> file format: qcow2π β
> virtual size: 10 GiB (10737418240 bytes)π β
> disk size: 6.16 GiBπ β
> cluster_size: 65536π β
> Format specific information:π β
> compat: 1.1π β
> compression type: zlibπ β
> lazy refcounts: falseπ β
> refcount bits: 16π β
> corrupt: falseπ β
> extended l2: falseπ β
> Child node '/file':π β
> filename:
> /var/lib/avocado/data/avocado-vt/images/jeos-27-x86_64.qcow2π β
> protocol type: fileπ β
> file length: 6.16 GiB (6614810624 bytes)π β
> disk size: 6.16 GiBπ β
> Format specific information:π β
> extent size hint: 1048576π β
>
> After blockcopy, check target image:π β
> # qemu-img info -U /var/lib/avocado/data/avocado-vt/images/copy.qcow2 π
> β
> image: /var/lib/avocado/data/avocado-vt/images/copy.qcow2π β
> file format: qcow2π β
> virtual size: 10 GiB (10737418240 bytes)π β
> disk size: 6.64 GiBπ β
> cluster_size: 65536π β
> Format specific information:π β
> compat: 1.1π β
> compression type: zlibπ β
> lazy refcounts: falseπ β
> refcount bits: 16π β
> corrupt: falseπ β
> extended l2: falseπ β
> Child node '/file':π β
> filename: /var/lib/avocado/data/avocado-vt/images/copy.qcow2π β
> protocol type: fileπ β
> file length: 6.64 GiB (7126974464 bytes)π β
> disk size: 6.64 GiBπ β
>
> Guest disk xml:π β
> <disk type='file' device='disk'>π β
> <driver name='qemu' type='qcow2'/>π β
> <source
> file='/var/lib/avocado/data/avocado-vt/images/jeos-27-x86_64.qcow2'
> index='2'/>π β
> <backingStore/>π β
> <target dev='vda' bus='virtio'/>π β
> <alias name='virtio-disk0'/>π β
> <address type='pci' domain='0x0000' bus='0x04' slot='0x00'
> function='0x0'/>π β
> </disk>π β
>
> Qemu command line:π β
> -blockdev
> '{"driver":"file","filename":"/var/lib/avocado/data/avocado-vt/images/jeos-27-x86_64.qcow2","node-name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"}'
> \π β
> -blockdev
> '{"node-name":"libvirt-1-format","read-only":false,"driver":"qcow2","file":"libvirt-1-storage","backing":null}'
> \π β
> -device
> '{"driver":"virtio-blk-pci","bus":"pci.4","addr":"0x0","drive":"libvirt-1-format","id":"virtio-disk0","bootindex":1}'
> \π β
>
> Qemu monitor command grepped from libvirt log:π β
>
> {"execute":"blockdev-add","arguments":{"driver":"file","filename":"/var/lib/avocado/data/avocado-vt/images/copy.qcow2","node-name":"libvirt-2-storage","auto-read-only":true,"discard":"unmap"},"id":"libvirt-429"}
> π β
>
> {"execute":"blockdev-create","arguments":{"job-id":"create-libvirt-2-format","options":{"driver":"qcow2","file":"libvirt-2-storage","size":10737418240,"cluster-size":65536}},"id":"libvirt-430"}
> π β
>
> {"execute":"job-dismiss","arguments":{"id":"create-libvirt-2-format"},"id":"libvirt-432"}
> π β
>
> {"execute":"blockdev-add","arguments":{"node-name":"libvirt-2-format","read-only":false,"driver":"qcow2","file":"libvirt-2-storage","backing":null},"id":"libvirt-433"}
> π β
>
> {"execute":"blockdev-mirror","arguments":{"job-id":"copy-vda-libvirt-1-format","device":"libvirt-1-format","target":"libvirt-2-format","sync":"full","auto-finalize":true,"auto-dismiss":false},"id":"libvirt-434"}
> π β
>
> {"execute":"transaction","arguments":{"actions":[{"type":"block-dirty-bitmap-add","data":{"node":"libvirt-2-format","name":"libvirt-tmp-activewrite","persistent":false,"disabled":false}}]},"id":"libvirt-443"}
> π β
>
> {"execute":"job-complete","arguments":{"id":"copy-vda-libvirt-1-format"},"id":"libvirt-444"}
> π β
>
