Thanks all for your reply. Actually, my lab environment is a lab manager environment, the multiple delta disks may caused by lab manager create configuration from template, and clone to library then clone to configuration from the library and so on. So it is not easy for us to consolidate the delta back to the primary one. One phenomenon I observed is, this issue usually occurs when there are lots of VMs deployed on one single server, and when the issue occurs, try to un-deploy several VMs could often resolve the problem, I am not sure if there are any limitation inside the system, or there is some kind of system defect occurs when specific resource is exhausted. We sometimes really feel frustrated with it.
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