IBM Storwize V7000, Введение и руководство по внедрению

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IBM Flex System V7000 Storage Node Introduction and Implementation Guide
5.7.2 FlashCopy Consistency Group menu
FlashCopy Consistency Groups are used to group multiple copy operations together that
have a need to be controlled at the same time. In this way the group can be controlled by
starting, stopping, and so on, with a single operation. Additionally, the function will ensure that
when stopped for any reason, the IOs to all group members have all stopped at the same
“point-in-time” in terms of the host writes to the primary volumes, ensuring time consistency
across volumes.
Clicking FlashCopy

Consistency Group opens the window shown in Figure 5-56. This
window enables FlashCopy relationships to be placed into a consistency group. You can also
use start and stop commands against the FlashCopy consistency group from this window by
right-clicking the relationship.
Figure 5-56 FlashCopy Consistency Group window
Consistency groups address the problem of applications having related data that spans
multiple volumes. In this situation, FlashCopy operations must be performed in a way that
preserves data integrity across the multiple volumes. One requirement for preserving the
integrity of data being written is to ensure that dependent writes are run in the intended
sequence of the application.