Hi BCAlex, and welcome to the VMware Communities!
The messages you are seeing indicate that the guest OS is programming the virtualized DMA (Direct Memory Access) controller in an unexpected way. It's not necessarily related to disk accesses or bad hardware, but could indicate bad drivers inside the guest, a defect in the guest OS itself, or that the guest OS doesn't like something about the virtual environment.
Which guest OS is running inside the virtual machine which gives those errors? What is the guest OS is doing at the time those messages appear? Do they appear regularly, or only at specific times?
Cheers,
--
Darius