too many VDI/VHD per VM, how to get rid of unused ones
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 thanks Olivier, i thought while im having this nightmare i mightaswell update my XOA at the same time so if XOA auto unplugs the vbd to the vdi, why is it throwing errors? 
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 This is a message for XO team, it should do that normally. 
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 its still there ie the host is still atached to that vdi im thinking this is the issue why my backups wont run anymore if not i will do it on the xen server cli, but it would be nice to know why this isnt working 
