If you are interested in the IBM Storage DS8870 device, the following IBM Redbook may be of interest: IBM DS8870 Copy Services for IBM z Systems This Redbooks publication helps you plan, install, tailor, configure, and manage Copy Services on the IBM DS8870 in an IBM z Systems environment. It addresses e.g. Flashcopy. More information is here . ... and there is a DS8870 Redpaper: IBM DS8870 and IBM z Systems Synergy - here .