HP XP Racks - Manual (Page 176)

Conditions that disrupt copy group distribution relationships
Copy group linkage is disrupted if either of the following conditions occur:
• The distribution relationship of the primary side DADID and secondary side DADID used by the
copy group is deleted
• The primary host of the copy group is deleted from the information source
If either of the conditions occur, the relevant copy group cannot be a distribution target. In order to
perform distribution again it is necessary to delete the distribution destination copy group and clear
the copy group definition file.
About pre-distribution of copy group definition files
Pre-distribution of copy group definition files involves distribution of the latest copy group definition
file from the current primary host to the copy group that will be the next primary host. This distribution
occurs when the primary host is being changed and the copy group definition of the original primary
host does not match the copy group definition of the new primary host. During this distribution, the
file can be distributed to only one user-selected primary host (destination).
Pre-distribution of copy group configuration definition files prevents the following problems:
• A copy group definition is no longer current because the primary host has changed.
• The primary host and copy group definition file are changed concurrently resulting in the primary
host's configuration definition file being inconsistent before and after the change. In this case, if
distribution of the copy group definition file starts after the primary host has been changed, the
old copy group definition file is distributed.
CAUTION:
There is no way to recover the latest copy group definition files once all the copies of the files have
been replaced with old files. This situation can be avoided by excluding the primary hosts of any old
copy group definition files from being the target primary host.
Related topics
• About distributing copy group definitions , page 174
• Prerequisites for distribution destination hosts (copy group definitions) , page 175
Confirming distribution hosts
To confirm target distribution hosts and last distributed time:
1. Display the copy group information in the host or pair configurations view.
For details on how to display this information, see “ Viewing copy group information in the Hosts
view (open systems) ” on page 300.
2.
Click the icon of the copy group for which you want to confirm target distribution hosts.
The Distribution Hosts - copy group name window is displayed.
3. On the Distribution hosts pane, review target host information and last distributed time.
4. Click Close to exit the window.
Managing pair life cycle 176