On Wed, Mar 18, 2015 at 5:33 PM, Shanzhi Yu <shyu@redhat.com> wrote:

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*From: *"Deepak Shetty" <dpkshetty@gmail.com> *To: *libvir-list@redhat.com *Sent: *Wednesday, March 18, 2015 7:19:05 PM *Subject: *[libvirt] Domain XML isn't dumping full backing chain

Hi, I am using libvirt version 1.2.9.2 on F21 and i am unable to get the complete backing chain info in the virsh dumpxml output. Details below :

*My backing chain per qemu-img :*

[stack@devstack-f21 test]$ qemu-img info --backing-chain snap4.qcow2 image: snap4.qcow2 file format: qcow2 virtual size: 1.0G (1073741824 bytes) disk size: 196K cluster_size: 65536 backing file: ./snap3.qcow2 Format specific information: compat: 1.1 lazy refcounts: false

image: ./snap3.qcow2 file format: qcow2 virtual size: 1.0G (1073741824 bytes) disk size: 196K cluster_size: 65536 backing file: ./snap2.qcow2 (actual path: ././snap2.qcow2) Format specific information: compat: 1.1 lazy refcounts: false

image: ././snap2.qcow2 file format: qcow2 virtual size: 1.0G (1073741824 bytes) disk size: 196K cluster_size: 65536 backing file: ./snap1.qcow2 (actual path: ./././snap1.qcow2) Format specific information: compat: 1.1 lazy refcounts: false

image: ./././snap1.qcow2 file format: qcow2 virtual size: 1.0G (1073741824 bytes) disk size: 196K cluster_size: 65536 backing file: ./base.qcow2 (actual path: ././././base.qcow2) Format specific information: compat: 1.1 lazy refcounts: false

image: ././././base.qcow2 file format: qcow2 virtual size: 1.0G (1073741824 bytes) disk size: 196K cluster_size: 65536 Format specific information: compat: 1.1 lazy refcounts: false

If you want prepare the backing chain yourself, you should add "-o backing_fmt=$farmat" options, like "qemu-img create -f qcow2 base.s1 -b base.qcow2 -o backing_fmt=qcow2"

Thanks, it works after I did the above thanx, deepak