Put another way, my intention was to allocate the disk from the previous v1.1.1 install as a Longhorn storage class. Unexpectedly, the installation succeeded on the correct disk, but the persistence volumes from the v1.1.1 installation were re-used with the v1.1.2 installation. I only selected the new disk in the v1.1.2 installer, but the old disk was used as well as the new disk.