Chapter 9.3.6. Using FlashCopy to help with migration
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156 SAN Volume Controller: Best Practices and Performance Guidelines 9.3.5 Using FlashCopy with your backup application If you are using FlashCopy together with your backup application and you do not intend to keep the target disk after the backup has completed, we recommend that you create the FlashCopy mappings using a NOCOPY rate. With the NOCOPY rate, the SVC copies blocks that change on the source that are not already on the target to the target, because they have changed. If a read on the target occurs when a block has not yet occurred, the read is automatically fulfilled using the source VDisk. Thus, using anything other than NOCOPY adds unnecessary additional I/ O activity ...
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