IBM DS8000 FlashCopy to Pprc Primary Volume, FlashCopy Source Volume FlashCopy Target Volume

A more detailed discussion of the concept of data consistency and how to manage the Consistency Group operation is in 7.2.5, “What is a Consistency Group?” on page 132.

Important: Consistency Group FlashCopy can create host-based consistent copies, they are not application-based consistent copies. The copies have power-failor crash level 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 not available through the use of 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 point-in-time copies at a local site and then use remote mirroring commands to copy the data to the remote site. We explain the functions of Remote Mirror and Copy in the 7.2.3, “Remote Mirror and Copy (Peer-to-Peer Remote Copy)” on page 123.

FlashCopy Source Volume

FlashCopy Target Volume

FlashCopy to PPRC Primary Volume

	PPRC relation
PPRC	PPRC
Primary Volume	Secondary Volume

Figure 7-6 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.

122DS8000 Series: Concepts and Architecture