[libvirt-users] Whether libvirt can support all backing chain layer are iscsi network disk type

[Peter Krempa]

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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