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.
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