Subsystem parameters for refining DFSMSdss COPY operation with utilities

You can use subsystem parameters to control whether utilities that invoke DFSMSdss COPY use FlashCopy® technology.

The following utilities invoke DFDSMSdss COPY:

• CHECK DATA with SHRLEVEL CHANGE
• CHECK INDEX with SHRLEVEL CHANGE
• CHECK LOB with SHRLEVEL CHANGE
• COPY with FLASHCOPY YES or FLASHCOPY CONSISTENT
• LOAD with FLASHCOPY YES or FLASHCOPY CONSISTENT
• REBUILD INDEX with FLASHCOPY YES or FLASHCOPY CONSISTENT
• RECOVER from FlashCopy image copies
• REORG INDEX with FLASHCOPY YES or FLASHCOPY CONSISTENT
• REORG TABLESPACE with FLASHCOPY YES or FLASHCOPY CONSISTENT

You can use the following subsystem parameters to control how FlashCopy technology is used by all utilities that invoke DFSMSdss COPY:

FLASHCOPY_XRCP

Specifies whether a data set level FlashCopy operation is allowed to a primary volume in a z Global Mirror (Extended Remote Copy or XRC) relationship when the z/OS® DFSMSdss support for RPFC for XRC is installed and enabled.

FLASHCOPY_PPRC

Specifies the behavior for DFSMSdss FlashCopy requests when the target disk storage volume is the primary device in a Peer-to-Peer Remote Copy (Metro Mirror) relationship.

In the case of the RECOVER utility, FLASHCOPY_PPRC specifies the default behavior when the recovery base is a FlashCopy image copy or a system-level backup. You can override this behavior by specifying the FLASHCOPY_PPRCP option in the RECOVER statement.

You can use the following subsystem parameters to specify how certain utilities use FlashCopy:

CHECK_FASTREPLICATION

Specifies whether the CHECK utilities direct DFSMSdss COPY to use FlashCopy as the preferred method for copying objects to shadow data sets, or as the only method for copying objects to shadow data sets.

COPY_FASTREPLICATION

Specifies whether the COPY utility directs DFSMSdss COPY to use FlashCopy as the preferred method for copying objects to shadow data sets, as the only method for copying objects to shadow data sets, or not at all.

REC_FASTREPLICATION

Specifies how the RECOVER utility directs DFSMSdss COPY to restore an image copy that was created with FlashCopy. REC_FASTREPLICATION directs DFSMSdss COPY to use FlashCopy as the preferred method, as the only method, or not to use FlashCopy.

The parameters that DFSMSdss COPY specifies for the RECOVER, COPY, and CHECK utilities depend on the combination of the FLASHCOPY_PPRC value and the REC_FASTREPLICATION, COPY_FASTREPLICATION, or CHECK_FASTREPLICATION value, as shown in the following table.