Configuring Consistency Group IDs for Hitachi Universal Replicator Device Groups in Asynchronous Mode

You can assign a consistency group ID (CTGID) to a protection group by setting the property ctgid=consistency-group-ID as an option to the geopg create command. You can assign CTGID values to device groups in one of two ways:

• You can add uninitialized device groups to the protection group. They are initialized and acquire the CTGID of the protection group when the protection group is started with the geopg start command.

• You can initialize a device group with the CTGID that you plan to use for the protection group that will hold that device group. After you create the protection group with that CTGID, you must assign the device group to it.

The following procedure demonstrates these two methods of setting the CTGID for the devices that are used by an application data service. The procedure configures a protection group named app1-pg with a CTGID of 5. This protection group contains the app1-rg resource group and the Hitachi Universal Replicator devgroup1 device group, which uses the async fence level.

Before You Begin

• Configure a Hitachi Universal Replicator device group with journal volumes in the /etc/horcm.conf file as described inConfiguring the /etc/horcm.conf File on the Nodes of the Primary Cluster and Configuring the /etc/horcm.conf File on the Nodes of the Secondary Cluster.

• Configure the devices in each device group as raw-disk devices or mirror them by using Veritas Volume Manager as described in How to Set Up Raw-Disk Device Groups for Sun Cluster Geographic Edition Systems or How to Configure Veritas Volume Manager Volumes for Use With Hitachi TrueCopy Replication.

• Configure a Sun Cluster resource group that includes a resource of type HAStoragePlus in addition to any other resources that are required for its application data service. This HAStoragePlus resource must use the disk devices of a previously configured Hitachi Universal Replicator device group as described in How to Configure the Sun Cluster Device Group That Is Controlled by Hitachi TrueCopy or Universal Replicator Software and How to Configure a Highly Available File System for Hitachi TrueCopy or Universal Replicator Replication.

1. On the primary cluster, create the Sun Cluster Geographic Edition protection group with a specified CTGID, and add the resource group.

   phys-paris-1# geopg create -s paris-newyork-ps -o primary -d truecopy -p ctgid=5 \ -p nodelist=phys-paris-1,phys-paris-2 app1-pg

   phys-paris-1# geopg add-resource-group app1-rg app1-pg

2. Add device groups to the protection group by using one of the following methods:

   • Add device groups that have been configured in the /etc/horcm.conf file but have not been initialized by using the paircreate command.

     phys-paris-1# geopg add-device-group -p fence_level=async devgroup1 app1-pg

   • Assign CTGIDs to device groups when they are initialized by using the Hitachi paircreate command, and add the device groups to the protection group that has the same value for the CTGID property.

     In the following example, a device group is initialized with the CTGID of 5 and then added to the app1-pg protection group:

     phys-paris-1# paircreate -g devgroup1 -vl -f async 5

     phys-paris-1# geopg add-device-group -p fence_level=async devgroup1 app1-pg

3. Start the protection group.

   phys-paris-1# geopg start -e local app1-pg

   Uninitialized device groups, if any, are initialized and assigned the CTGID of 5.