Using the Advanced Copy Services enhancements

z/OS® V2R1 adds the following Advanced Copy Services enhancements:

Multi-Target Mirror support.
A Multi-Target Mirror environment allows a device to be the primary of more than one PPRC pair. It simplifies recovery scenarios for cascaded configurations, when swapping from the local site to the intermediate site. With Multi-Target support, during a failover to the intermediate site, the intermediate device can become a primary to both the local and the remote, eliminating the need to suspend the intermediate to remote site pair when swapping back to the local site. It provides for the capability of an incremental resynchronization between the two secondary volumes in both planned and unplanned swap scenarios.

For more information, refer to What is remote copy in z/OS DFSMS Advanced Copy Services
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Multiple Incremental FlashCopy targets (Incremental FlashCopy Version 2).
A FlashCopy source can now have more than one Incremental FlashCopy target. This is provided by Incremental FlashCopy Version 2 (V2). The previous support, which limits a FlashCopy source to 1 Incremental FlashCopy target, is now referred to as Incremental FlashCopy Version 1 (V1). For Incremental FlashCopy V2, the required software and microcode must be present.

With Incremental FlashCopy V2, you can request multiple Incremental FlashCopy targets by issuing multiple FRBACKUP FCINCREMENTAL commands, or with the FRBACKUP FCINCREMENTAL(ALL) command, which specifies that an incremental copy is to be created, and that all subsequent copy pool backup copies should also be incremental.

You can cause the system to revert to Incremental FlashCopy V1 by specifying MULTINCRFLC=NO in the DEVSUPxx member of parmlib.

For more information, refer to the topics about Incremental FlashCopy in z/OS DFSMS Advanced Copy Services, FRBACKUP in z/OS DFSMShsm Storage Administration and DEVSUPxx in z/OS MVS Initialization and Tuning Reference.
Workload-based write pacing.
Workload-based write pacing is an enhanced form of write pacing that exploits MVS workload management (WLM). It uses the importance value on each write I/O to determine the write pacing level to be used in the calculation for how much write pacing delay to inject, if any. For more information, refer to the topic about workload-based write pacing in z/OS DFSMS Advanced Copy Services.
XADDPAIRed primary volumes can remain offline when you issue the XSTART command for restart or the XADDPAIR command for suspended pairs. Utility volumes and secondary volumes must be online when you issue the XADDPAIR command.
For more information, refer to the topic about XRC operational considerations in z/OS DFSMS Advanced Copy Services.