Configuring Logical Hostnames

The logical hostname is a special high-availability (HA) resource. The geoadm start command configures the logical hostname that corresponds to the cluster name. The IP address and host maps for the logical hostname must be set up before you run this command. Before assigning hostnames, familiarize yourself with the legal names and values that are described in Appendix B, Legal Names and Values of Sun Cluster Geographic Edition Entities.

For more information about using the geoadm start command , see Enabling the Sun Cluster Geographic Edition Software.

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Note –

If you are using Sun StorageTek Availability Suite for data replication, a logical hostname is created for each device group to be replicated. For more information, see Chapter 1, Replicating Data With Sun StorageTek Availability Suite Software, in Sun Cluster Geographic Edition Data Replication Guide for Sun StorageTek Availability Suite.

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The following table lists the Sun Cluster and Sun Cluster Geographic Edition components that require IP addresses. Add these IP addresses to the following locations:

• All naming services that are being used

• The local /etc/inet/hosts file on each cluster node, after you install the Solaris OS software

Table 2–1 IP Addresses Required by Sun Cluster Geographic Edition Software

Component	Number of IP Addresses Needed
Sun Cluster administrative console	1 per subnet
IP Network Multipathing groups	Single-adapter groups – 1 primary IP address. For the Solaris 8 release, also 1 test IP address for each adapter in the group. Multiple-adapter groups – 1 primary IP address plus 1 test IP address for each adapter in the group.
Cluster nodes	1 per node, per subnet
Domain console network interface (Sun FireTM 15000)	1 per domain
Console-access device	1
Logical addresses	1 per logical host resource, per subnet
Sun Cluster Geographic Edition infrastructure hostname	1 logical IP address per cluster infrastructure.  For example, if you have two clusters in your Sun Cluster Geographic Edition infrastructure, you need two IP addresses.
Replication with Sun StorageTek Availability Suite software	1 dedicated logical IP address on the local cluster for each device group to be replicated.   For example, if you have two clusters in your Sun Cluster Geographic Edition infrastructure, you need two IP addresses.

For more information about configuring the IP address and host maps during the installation of Sun Cluster software, refer to Chapter 2, Installing Software on Global-Cluster Nodes, in Sun Cluster Software Installation Guide for Solaris OS.