Phased Migration

The following is assumed for the Phased Migration conversion strategy:

There is very little additional DASD space available and that the same storage volumes used today for static cache need to be reassigned for use as the dynamic cache.
There are too many SVTS subsystems running concurrently to convert all of them at once. You do not want short periods of down time during which no Virtual Devices are available.
The intent is to convert individual subsystems one at a time as DASD space and time permit. Some subsystems will be running static while others are running dynamic. If there are problems, you can tolerate a slow migration back to static.