Setting up remote command devices for use with CCI

This procedure explains how to configure open system command devices for use with CCI. If you are using BCM, CCI command devices are not needed. Refer to the Business Continuity Manager User Guide for information about how to set up command devices and a 3DC environment using BCM.

With remote command devices, communications between each pair of sites is performed automatically, allowing the delta resync operation to be run.

Before you begin

To set up the remote command devices, the following conditions must be met:

• Two command devices and two remote command devices must be set up on each site: the primary site, the TC secondary site, and the UR secondary site, as shown in the figure below. See Provisioning Guide.

• External paths must be set up on all sites for communications between command devices and remote command devices. See Universal Volume Manager User Guide for setting up external paths and remote command devices.

To allocate mirror IDs to remote command devices, the following conditions must be met:

• Create a 3DC multi-target configuration and UR delta resync pairs.

• Remote command devices are set up between each site. For more information about setting up the remote command devices, see the Universal Volume Manager User Guide .

Procedure

1. Set up four command devices each on the primary site and at the two secondary sites.

2. Set up and dedicate two external ports and two target ports on each site. Configure paths between external ports and target ports.

For details about external ports, see the Universal Volume Manager User Guide. For details about port and LU path settings, see the Provisioning Guide..

3. On each site, map a command device through a target port to a device on one of the other sites. You must map to the device on the other site as a remote command device, using an external port on that system. See Universal Volume Manager User Guide for information about mapping the remote command devices.

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.

5. Assign mirror IDs to the remote command devices. This is required to enable communication for delta resync operations.

Result

Thus:

• Each site must have two command devices mapped through two target ports to the other two sites.

• Each site must also have two remote command devices mapped-to through external ports from the other two sites.

The following illustration shows this command/remote command device configuration with port configuration.

Remote command devices in a delta resync configuration