4. Repeat the previous step so that two command devices on each site are mapped to a remote
command device on each of the other two sites.
Thus:
• Each site should have two command devices mapped via two target ports to the other two
sites.
• Each site should also have two remote command devices mapped to via external ports from
the other two sites.
The following figure shows the command/remote command device configuration.
Figure 23 Remote command device configuration for delta resync
When mapping to remote command devices on each site is complete, you must assign mirror IDs
to the remote command devices. This is required to enable communication for delta resync
operations.
Assign mirrors to remote command devices
The use of mirrors with remote command devices allows you to determine whether the delta resync
operation can be performed. You assign mirror IDs after setting up remote command devices as
described in the previous section.
Prerequisites
• To assign a mirror to a remote command device, the mirror’s status must be one of the following:
Initial, Active, Halt, Stopped, Hold, Holding, or Hold(Failure)
CAUTION: You can assign a mirror in the Initial status to a remote command device if the
mirror ID is 00.
• In one journal, up to two remote command devices can be assigned to two mirrors in one
operation.
To assign mirror IDs to remote command devices
1. In Remote Web Console, select Actions > Remote Copy > Continuous Access Journal > Journal
Operation. The Journal Operation window displays.
2. Click to change the mode from View to Modify.
3. In the tree, select a master or restore journal below Registered.
4. In the mirror list, right-click the mirror(s) that you want to assign to the remote command device
and click Mirror > Assign R-Cmd. Dev from the menu that displays. The Assign Remote
Command Device dialog box displays, as shown below.
142 Continuous Access Journal configurations with Continuous Access Synchronous
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