Draft Document for Review January 13, 2020 5:02 pm 8456ch_CopyServices.fm Chapter 5. DS8000 Copy Services overview  133 5.2.4 FlashCopy options 5.2.3 Benefits and use 5.2.2 No background copy option 5.2.1 The FlashCopy background copy By default, standard FlashCopy (also called  FULL copy ) starts a background copy process  that copies all point-in-time data to the target volume. After the completion of this process, the  FlashCopy relationship ends and the target volume becomes independent of the source. The background copy can slightly affect application performance because the physical copy  needs storage resources. The impact is minimal because host I/O always has higher priority  than the background copy. A standard FlashCopy relationship can also be established by using the NOCOPY option.  With this option, FlashCopy does not start a background copy. Point-in-time data is copied  only when a copy is required due to an update to the source or target. This option eliminates  the impact of the background copy.  The NOCOPY option is useful in the following situations: The point-in-time copy that is created by FlashCopy often is used when you need to produce  a copy of the production data with little or no application downtime. Use cases for the  point-in-time copy that is created by FlashCopy include online backup, testing new  applications, or creating a copy of transactional data for data mining purposes. To the host or  application, the target looks exactly like the original source. It is an instantly available binary  copy. FlashCopy provides many more options and functions. These options and capabilities are  described in this section: GLYPH<SM590000> When the target is not needed as an independent volume GLYPH<SM590000> When repeated FlashCopy operations to the same target are expected GLYPH<SM590000> Persistent FlashCopy GLYPH<SM590000> Incremental FlashCopy (refresh target volume) GLYPH<SM590000> Multiple relationship FlashCopy GLYPH<SM590000> Data Set FlashCopy GLYPH<SM590000> Consistency Group FlashCopy GLYPH<SM590000> FlashCopy on existing Metro Mirror or Global Copy primary GLYPH<SM590000> Inband commands over remote mirror link Persistent FlashCopy allows the FlashCopy relationship to remain even after the (FULL) copy  operation completes. You must explicitly delete the relationship to end it. Incremental FlashCopy requires that the background copy and the Persistent FlashCopy  options are enabled. The first full copy must be complete. Persistent FlashCopy Incremental FlashCopy (refresh target volume)