FlashCopy® is much faster than traditional data movement methods, especially when large amounts of data are moved. DFSMSdss can use FlashCopy during a full volume copy if the following requirements are met:

• The source devices and the target devices both support compatible levels of FlashCopy.
• The volumes must be in the same logical subsystem (LSS) of an ESS if the ESS supports only FlashCopy Version 1.
• The volumes must be in the same ESS.
• The FASTREPLICATION(NONE) keyword must not be specified.

For the best performance during full volume copy operations, specify the following keywords:

• ADMINISTRATOR
• ALLDATA(*)
• ALLEXCP
• PURGE

The performance improvement that is provided by these keywords is most significant when DFSMSdss uses FlashCopy or SnapShot to perform the copy.