Implementing Flashcopy; Flashcopy Mappings - IBM Storwize V5010 Manual

Figure 10-2 shows the redirection of the host I/O toward the source volume and the target
volume.
Figure 10-2 Redirection of host I/O

10.3 Implementing FlashCopy

This section describes how FlashCopy is implemented in the IBM Spectrum Virtualize
running on IBM Storwize.

10.3.1 FlashCopy mappings

FlashCopy occurs between a source volume and a target volume. The source and target
volumes must be the same size. The minimum granularity that IBM Spectrum Virtualize
supports for FlashCopy is an entire volume. It is not possible to use FlashCopy to copy only
part of a volume.
Important: As with any point-in-time copy technology, you are bound by operating system
and application requirements for interdependent data and the restriction to an entire
volume.
The source and target volumes must belong to the same IBM Storwize V5000 system Gen2
system, but they do not have to be in the same I/O Group or storage pool. FlashCopy
associates a source volume to a target volume through FlashCopy mapping.
To become members of a FlashCopy mapping, source and target volumes must be the same
size. Volumes that are members of a FlashCopy mapping cannot have their size increased or
decreased while they are members of the FlashCopy mapping.
FlashCopy mapping
A
target volume. FlashCopy mappings can be stand-alone or a member of a Consistency
Group. You can perform the actions of preparing, starting, or stopping FlashCopy on either a
stand-alone mapping or a Consistency Group.
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Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1
is the act of creating a relationship between a source volume and a