Issue with loosing configuration made outside sunstone/one

I have a problem with configuration of vm’s being wiped on poweroff/poweron cycles. This is in Vcenter environment where few machines were configured outside of sunston/one (specifically disk were added). When machine is shut down and brought online or capacity changes, new deployment file generated wipes disks that were added through Vcenter directly. Is this behavior configurable or is there way to update machine in sunstone with disks that were not attached through sunstone, so that they are maintained as long as the machine lives ?