Re: Merging / Combining multiple VMDK's on different datastores into one VMDK on yet another Datastore.

I would also prefer to get rid of any setups that use spanned volumes like this.
I would power of the VM, add a new 700gb or larger vmdk and thenboot into a Windows-based LiveCD.and clone spanned disk to the new larger one.
It may need some research when selecting a tool to use for the task.
To get the data across robocopy would do - but then you have to use something to make the vmdk bootable.