On Tue, Jan 09, 2018 at 22:12:00 -0500, Meina Li wrote:
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?
Libvirt can't introspect the backing chain for certain storage technologies, thus the <backingStore> elements are missing for them. Note that the chain should show up as unterminated (not having <backingStore/> in the last visible layer) which indicates that there may be images libvirt can't inspect. This will eventually be solved by keeping the full backing chain in the XML.