| 摘要 |
A method for swapping peer-to-peer remote copy (PPRC) secondary device definitions from a subchannel set other than zero to subchannel set zero by the utilization of control block-field manipulation includes identifying a PPRC primary and secondary device pair, wherein a PPRC primary device definition resides at subchannel set zero and the PPRC secondary device definition resides at a subchannel set other than subchannel set zero; within operating system definitions of the PPRC pair, exchanging physical information associated with the PPRC primary and secondary devices, including pathing, node descriptor, device number, and a field cross referencing device numbers of the PPRC pair; and within channel subsystem definitions of the PPRC primary and secondary devices, via a SwapSubchannel instruction, exchanging physical information, including path and control unit information while retaining a subchannel identifier, a subchannel set identifier, and a subchannel interruption parameter pointing to the operating system definition of the device.
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