[libvirt] can't start domain with a corrupted disk attatched

[lvroyce]

Hi all,

    I came across below issue when testing:

    1.make a volume and attach it to  a domain A
    2.unplug the vg from the host in order to emulating a volume failure
    3.start domain A(failed)

     In step 3 can't start domainA . because can't find disk listed in 
xml when create the Domain.

     I'm not sure if it is reasonable. In common sense, we can still 
start our system even if we have a corrupt data disk .And also ,if in 
data center we carelessly attatch a corrupt volumn to all the guest, it 
will result in all guests fail to boot .

     I suggest to  automatically detach a disk if it can't be found and 
just give out a warning.Please let me know your opinion about if it is a 
bug or a feature.Thanks.