Nandini, please tell me more about the vm RDBMS1WFSD1001. Does it still exist? Is it backed by a regular storage account or is it using a managed disk?
Since this is coming from Azure, I think this is the best that we can do: https://github.com/ManageIQ/manageiq-providers-azure/pull/44
Verified that the code is present in 5.9.0.11 since this issue is hard to reproduce.