Setting up remote command devices for delta resync

To perform delta resync, remote command devices must be set and mirror IDs must be allocated to remote command devices.

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

• Two command devices are set on each site: the primary site, the TC secondary site, and the UR secondary site. For more information about setting up the command device, see the Provisioning Guide for Virtual Storage Platform Gx00 and Fx00 Models .

• External path is set up between the sites. For more information about setting up the external path, see the Universal Volume Manager User Guide .

For more information about setting up the remote command device, see the Universal Volume Manager User Guide .

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 .

For more information about allocating mirror IDs to remote command devices, see the related topics.

The following figure shows the configuration of the external paths, command devices, and remote command devices.

To set up remote command devices:

1. Map remote command devices to each site.

2. Assign mirror IDs to remote command devices.