GLYPH<SM590000> In a reverse FlashCopy, the grain size of all the FlashCopy mappings that participate must  be the same. GLYPH<SM590000> No FlashCopy mapping can be added to a consistency group while the FlashCopy  mapping status is  Copying .  GLYPH<SM590000> No FlashCopy mapping can be added to a consistency group while the consistency group  status is  Copying . GLYPH<SM590000> The use of Consistency Groups is restricted when using Cascading FlashCopy. A  Consistency Group serves the purpose of starting FlashCopy mappings at the same point  in time. Within the  same  Consistency Group, it is not possible to have mappings with these  conditions: – The source volume of one mapping is the target of another mapping. – The target volume of one mapping is the source volume for another mapping. GLYPH<SM590000> Both source and target volumes can be used as primary in a Remote Copy relationship.  For more details about the FlashCopy and the Remote Copy possible interactions see  “Interaction between Remote Copy and FlashCopy” on page 227. FlashCopy presets These combinations are not useful because within a Consistency Group, mappings  cannot be established in a certain order. This limitation renders the content of the target  volume undefined. For instance, it is not possible to determine whether the first mapping  was established before the target volume of the first mapping that acts as a source volume  for the second mapping.  Even if it were possible to ensure the order in which the mappings are established within a  Consistency Group, the result is equal to Multi Target FlashCopy (two volumes holding the  same target data for one source volume). In other words, a cascade is useful for copying  volumes in a certain order (and copying the changed content targets of FlashCopies),  rather than at the same time in an undefined order (from within one single Consistency  Group). The IBM Spectrum Virtualize/Storwize GUI interface provides three FlashCopy presets  (Snapshot, Clone, and Backup) to simplify the more common FlashCopy operations.  Figure 5-9 on page 195 shows the preset selection panel in the GUI. 194  IBM System Storage SAN Volume Controller, IBM Storwize V7000, and IBM FlashSystem 7200 Best 