Hi, For backing chain that all images are iscsi network disk type , such as iscsi://ip/iqn../0(base image) <-iscsi://ip/iqn../1(active image). Currently, 'qemu-img info --backing-chain' command can display correct backing file info, but after starting guest with the active image in backing chain, it don't include the related <backingStore> element in dumpxml.
So, Whether libvirt can support all backing chain layer are iscsi network disk type? Best Regards Meina Li On Wed, Jan 3, 2018 at 6:39 AM, Meina Li <me...@redhat.com> wrote: > Hi, > > I am a libvirt qe, I am testing the function about the new location of > disk auth element (as sub-element of the source element) in Backing Chain > Management. And I have a questions: > > When all the backing chain are iscsi network disk type(no matter if the > authentication is exist), start the guest , it will only has the top > level disk in xml and there are no other backingStore in it. The test step > is below. > > So can this function support all backing chain with network disk type > actually, or only use network authentication as the base image for backing > chain of file disk type? > > Can you help reviewing it? Thanks very much in advance! > > Test step: > 1. iSCSI server: > o- iscsi ............................................................ > ................................................ [Targets: 2] > | o- iqn.2003-01.org.linux-iscsi.localhost.x8664:sn.9cba196611e6 > ....................................................... [TPGs: 1] > | | o- tpg1 > ..................................................................................... > [gen-acls, tpg-auth, 1-way auth] > | | o- acls .............................. > ............................................................................ > [ACLs: 0] > | | o- luns .............................. > ............................................................................ > [LUNs: 4] > | | | o- lun0 .............................. > .................................. [fileio/file1 (/tmp/lun1.img) > (default_tg_pt_gp)] > | | o- portals .............................. > ...................................................................... > [Portals: 1] > | | o- 0.0.0.0:3260 .............................. > ....................................................................... > [OK] > | o- iqn.2003-01.org.linux-iscsi.localhost.x8664:sn.a8d92ebb4ece > ....................................................... [TPGs: 1] > | o- tpg1 ............................................................ > ...................................... [gen-acls, no-auth] > | o- acls .............................. > ............................................................................ > [ACLs: 0] > | o- luns .............................. > ............................................................................ > [LUNs: 3] > | | o- lun0 .............................. > .................................. [fileio/file3 (/tmp/lun3.img) > (default_tg_pt_gp)] > | o- portals .............................. > ...................................................................... > [Portals: 1] > | o- 0.0.0.0:3260 .............................. > ....................................................................... > [OK] > > 2. Set iscsi secret. > # cat iscsi-secret.xml > <secret ephemeral='no' private='yes'> > <description>iSCSI secret</description> > <usage type='iscsi'> > <target>libvirtiscsi</target> > </usage> > </secret> > # virsh secret-define iscsi-secret.xml > Secret 47bd2f3e-023f-44ba-85a3-e8fa7f16ff23 created > # MYSECRET=`printf %s "redhat" | base64` > # virsh secret-set-value 47bd2f3e-023f-44ba-85a3-e8fa7f16ff23 $MYSECRET > Secret value set > > 3. Create backing chain. > # qemu-img create -f qcow2 -b iscsi://redhat:redhat@10.66.7. > 27:3260/iqn.2003-01.org.linux-iscsi.localhost.x8664:sn.9cba196611e6/0 > iscsi://10.66.7.27:3260/iqn.2003-01.org.linux-iscsi.localhost.x8664:sn. > a8d92ebb4ece/0 -o backing_fmt=qcow2 > > 4. Start guest. > # qemu-img info iscsi://10.66.7.27:3260/iqn.2003-01.org.linux-iscsi. > localhost.x8664:sn.a8d92ebb4ece/0 --backing-chainimage: json:{"driver": > "qcow2", "file": {"lun": "0", "portal": "10.66.7.27:3260", "driver": > "iscsi", "transport": "tcp", "target": "iqn.2003-01.org.linux-iscsi. > localhost.x8664:sn.a8d92ebb4ece"}} > file format: qcow2 > virtual size: 5.0G (5368709120 <0536%20870%209120> bytes) > disk size: unavailable > cluster_size: 65536 > backing file: iscsi://redhat:redhat@10.66.7.27:3260/iqn.2003-01.org.linux- > iscsi.localhost.x8664:sn.9cba196611e6/0 > backing file format: qcow2 > Format specific information: > compat: 1.1 > lazy refcounts: false > refcount bits: 16 > corrupt: false > > image: json:{"driver": "qcow2", "file": {"lun": "0", "portal": " > 10.66.7.27:3260", "driver": "iscsi", "transport": "tcp", "user": > "redhat", "password": "redhat", "target": "iqn.2003-01.org.linux-iscsi. > localhost.x8664:sn.9cba196611e6"}} > file format: qcow2 > virtual size: 5.0G (5368709120 <0536%20870%209120> bytes) > disk size: unavailable > cluster_size: 65536 > Format specific information: > compat: 1.1 > lazy refcounts: false > refcount bits: 16 > corrupt: false > > # virsh dumpxml rhel7 | grep disk -A 9 > ... > <disk type='network' device='disk'> > <driver name='qemu' type='qcow2'/> > <source protocol='iscsi' name='iqn.2003-01.org.linux- > iscsi.localhost.x8664:sn.a8d92ebb4ece/0'> > <host name='10.66.7.27' port='3260'/> > </source> > <target dev='vdb' bus='virtio'/> > <alias name='virtio-disk1'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x09' > function='0x0'/> > </disk> > ... > > > Best Regards > Meina Li >
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