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 subsystem parameters control whether FlashCopy technology is used:

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:

• Whether DFSMSdss preserves mirroring while processing a DB2® utilities request
• Whether the target device pair is allowed to go to duplex pending state

The FLASHCOPY_PPRC parameter applies to the following utilities in all migration modes:

• CHECK DATA
• CHECK INDEX
• CHECK LOB

The FLASHCOPY_PPRC parameter parameter also applies to the folling utilities in new-function mode only:

• COPY
• LOAD
• REBUILD INDEX
• RECOVER
• REORG TABLESPACE
• REORG INDEX

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 utility depend on the combination of values for FLASHCOPY_PPRC and REC_FASTREPLICATION that you specify, as shown in the following table.