HP P9000 Business Continuity Manager User Guide

Creating an Inter-Control Unit Logical Path dedicated to the command device
If the Remote DKC Control Function is used in an environment that has a large number of copy
pairs, and the logical path is heavily loaded due to mass remote copy processing, command
execution may take an excessive amount of time.
For example, command execution tends to take an excessive amount of time in the following cases:
• The YKQUERY command is executed on a Cnt Ac-S Z, Cnt Ac-A, or Cnt Ac-J Z copy group.
• The YKQUERY command is executed on an BC Z copy group on the secondary site.
To shorten the command execution time when there are a large number of copy pairs, you should
create an inter-control unit logical path that is dedicated to the command device and that is separate
from the logical paths used for remote copying, and use this path for the Remote DKC Control
Function.
This section explains how to create an inter-control unit logical path dedicated to the command
device.
Supporting a Cnt Ac-S Z or Cnt Ac-A Z copy group configuration
To create an inter-control unit logical path dedicated to the command device:
1. Establish an inter-control unit logical path.
For Continuous Access Synchronous for Mainframe or Continuous Access Asynchronous for
Mainframe: Ensure that the control unit does not belong to the P-VOL or the S-VOL contained
in a Continuous Access Synchronous for Mainframe or Continuous Access Asynchronous for
Mainframe copy group.
This inter-control unit logical path must be assigned a port number that is different from the
port number of the inter-control unit logical path to be used by the Cnt Ac-S Z or Cnt Ac-A
copy group.
2. Create a command device on the CU with which the inter-control unit logical path dedicated
to the command device has been established.
Figure 70 (page 122) shows an example of Cnt Ac-S Z or Cnt Ac-A copy group configuration.
Figure 70 Example of Cnt Ac-S Z and Cnt Ac-A Z copy group configuration
122 Preparing to use Business Continuity Manager