1. A computer-implemented method, comprising: copying, a virtual logical unit that stores learning metadata, from a first storage server to a second storage server, wherein the learning metadata indicates a type of storage device in which data of the first storage server is stored; copying logical units corresponding to the data from the first storage server to the second storage server; and using the learning metadata to place a selected data in the type of storage device indicated by the learning metadata, subsequent to the copying of the logical units and subsequent to the copying of the virtual logical unit.