z/OS® V2R1 adds the following
Advanced Copy Services enhancement:
- 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.
- 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.
- Workload-based write pacing, 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.
- 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.