In Rancher, stack scoped volumes are named with the stack name as a prefix to indicate which stack the volume is scoped to and suffixed with a random number to guarantee no duplication. When referencing the volume, you still use the original volume name. For example, if you create a volume called foo in stackA, the volume name in the UI and on your hosts will be stackA_foo_, but to use the same volume in your service, you would use the name foo.