HP XP Racks - Manual (Page 167)

Limitations when performing 3DC configuration pair operations (mainframe systems)
The following limitations and resolutions are to be noted when performing 3DC configuration pair
operations:
• When operating Delta Resync, it is necessary to switch the direction of Continuous Access Syn-
chronous in advance. Because Replication Manager does not switch the direction automatically,
it is necessary to switch the direction manually.
• The Force option cannot be added when executing Delta Resync.
• Delta Resync can be executed for copy groups only. It cannot be executed for CTGs or copy pairs.
• If a related Cnt Ac-J is deleted, the DeltaUR pair transitions to Simplex status. However the DeltaUR
pair information is not updated in Replication Manager. The DeltaUR pair information will be
deleted when a configuration update is performed. To resolve this, it is first necessary to delete
the DeltaUR and then delete the related Cnt Ac-J pair.
Defining copy groups in a multi-target or cascade configuration
To define copy groups in a multi-target or cascade configuration:
1. Perform the pair group registration operations.
2. To create a multi-target configuration, select a primary volume, and then click Add Group. To
create a cascade configuration, select a secondary volume, and then click Add Group.
3. For each pair group, define a list of copy pairs that you want to include in the pair group.
4. On the 3. Group Management page, create a copy group and assign a pair group to the copy
group.
5. Repeat the operations for creating a copy group and assigning a pair group to the copy group.
Related topics
• Creating pairs and pair groups , page 154
• Copy type requirements for pair configuration definitions , page 164
• Permitted topologies for cascade and multi-target configurations , page 165
• About multi target and cascade copy pair configurations , page 163
Creating a 3DC multi-target configuration
To create a 3DC multi-target configuration that uses the delta resync function:
1. Create Continuous Access Synchronous and Continuous Access Journal pair groups in a multi-target
configuration.
2. With the secondary volume of the Continuous Access Synchronous pair selected, click Add Group.
3. Specify the copy type option as Cnt Ac-J (3DC Delta).
Related topics
• About delta resync , page 166
• Creating pairs and pair groups , page 154
• Creating copy groups , page 160
• Defining copy groups in a multi-target or cascade configuration , page 167
User Guide 167