My take on the DR scenarios is that unless you are building your own recovery site to match your production site, you can never guarantee the device addressing. So, you need to build address configuration changes in to your DR Plan. You may not need to change some addresses from exercise to exercise, but on our last test, we had to change addresses within seven d ays of the exercise.
Running your production z/OS or Linux under the vendor's floor z/VM syste m means you need to customize their directory, where running under your own z/VM means you can predefine some of those entries. Our z/OS systems run in their own LPARs at home, but in predefined virtual machines at DR. This w ay the z/OS people don't need to do IO(whatever) changes. My linuxes only ne ed network definition changes which I will be prestaging before our next exercise. After 12+ years of DR heartburn, my feeling is it is easier to adjust MY z/VM system than to adjust the DR vendor's floor system. /Thomas Kern /U.S. Department of Energy /301-903-2211 /301-905-6427
