
A more detailed discussion of the concept of data consistency and how to manage the Consistency Group operation is in 6.2.5, “What is Consistency Group?” on page 105.
Important: Consistency Group FlashCopy can create
consistency. This means that if you suddenly power off your server without stopping your applications and without destaging the data in the file cache, the data in the file cache may be lost and you may need recovery procedures to restart your applications. To start your system with Consistency Group FlashCopy target volumes, you may need the same operations as the crash recovery.
For example, If the Consistency Group source volumes are used with a journaled file system (like AIX JFS) and the source LUNs are not unmounted before running FlashCopy, it is likely that fsck will have to be run on the target volumes.
Note: Consistency Group FlashCopy is only available through the use of CLI commands and not the DS Storage Manager GUI at the current time.
Establish FlashCopy on existing Remote Mirror and Copy primary
This option allows you to establish a FlashCopy relationship where the target is also a remote mirror primary volume. This enables you to create full or incremental
FlashCopy Source Volume
FlashCopy Target Volume
FlashCopy to PPRC Primary Volume
| PPRC relation |
PPRC | PPRC |
Primary Volume | Secondary Volume |
Figure 6-6 Establish FlashCopy on existing Remote Mirror and Copy primary
Note: You cannot FlashCopy from a source to a target, where the target is also a Global Mirror primary volume.
96DS6000 Series: Concepts and Architecture