Determining Requirements for Project Configuration

Before you configure data services to use the controls provided by Solaris in a Sun Cluster environment, you must decide how to control and track resources across switchovers or failovers. Identify dependencies within your cluster before configuring a new project. For example, resources and resource groups depend on disk device groups.

Use the nodelist, failback, maximum_primaries and desired_primaries resource group properties that are configured with scrgadm(1M) to identify nodelist priorities for your resource group.

• For a brief discussion of the node list dependencies between resource groups and disk device groups, refer to Relationship Between Resource Groups and Disk Device Groups in Sun Cluster Data Services Planning and Administration Guide for Solaris OS.

• For detailed property descriptions, refer to rg_properties(5).

Use the preferenced property and failback property that are configured with scrgadm(1M) and scsetup(1M) to determine disk device group nodelist priorities.

• For conceptual information about the preferenced property, see Multiported Disk Device Groups.

• For procedural information, see “How To Change Disk Device Properties” in Administering Disk Device Groups in Sun Cluster System Administration Guide for Solaris OS.

• For conceptual information about node configuration and the behavior of failover and scalable data services, see Sun Cluster System Hardware and Software Components.

If you configure all cluster nodes identically, usage limits are enforced identically on primary and secondary nodes. The configuration parameters of projects do not need to be identical for all applications in the configuration files on all nodes. All projects that are associated with the application must at least be accessible by the project database on all potential masters of that application. Suppose that Application 1 is mastered by phys-schost-1 but could potentially be switched over or failed over to phys-schost-2 or phys-schost-3. The project that is associated with Application 1 must be accessible on all three nodes (phys-schost-1, phys-schost-2, and phys-schost-3).

Project database information can be a local /etc/project database file or can be stored in the NIS map or the LDAP directory service.

The Solaris Operating System enables for flexible configuration of usage parameters, and few restrictions are imposed by Sun Cluster. Configuration choices depend on the needs of the site. Consider the general guidelines in the following sections before configuring your systems.