Methods and Computer Program Products for Swapping Synchronous Replication Secondaries from a Subchannel Set Other Than Zero to Subchannel Set Zero Using Dynamic I/O

摘要

Exemplary embodiments relate to a method for swapping PPRC secondary device definitions from a subchannel set other than zero to subchannel set zero. The method comprises identifying a PPRC primary and secondary device, wherein the PPRC primary device definitions reside at subchannel set zero and the PPRC secondary device definitions reside at a subchannel set other than subchannel set zero, initiating a PPRC device definition substitution operation to substitute the PPRC primary device definitions within the subchannel set where the PPRC secondary device definition resides and substitute the PPRC secondary device definitions within the subchannel set where the PPRC primary device definitions resides, storing the control block information for each PPRC device whose device definitions are to be substituted, and storing the PPRC primary device definitions within the subchannel set where the PPRC secondary device definition resides and storing the PPRC secondary device definitions within subchannel set zero.