Drives, apparently. A virtual private server typically doesn't have drives, it's just a jail or a container on a larger UNIX system.
If you have an actual virtual machine, there might be drives in the form of a vtbd device (look for /dev/vtbd0) which would be what you might find on a QEMU or KVM based VM. If "camcontrol devlist" lists nothing, though, it's not likely there's any supported drives.