Sun Cluster Software Installation Guide for Solaris OS

Private Network

Note –

You do not need to configure a private network for a single-host global cluster. The scinstall utility automatically assigns the default private-network address and netmask, even though a private network is not used by the cluster.

Sun Cluster software uses the private network for internal communication among nodes and among non-global zones that are managed by Sun Cluster software. A Sun Cluster configuration requires at least two connections to the cluster interconnect on the private network. When you configure Sun Cluster software on the first node of the cluster, you specify the private-network address and netmask in one of the following ways:

If you choose to specify a different netmask, the scinstall utility prompts you for the number of nodes and the number of private networks that you want the IP address range to support. On the Solaris 10 OS, the utility also prompts you for the number of zone clusters that you want to support. The number of global-cluster nodes that you specify should also include the expected number of unclustered non-global zones that will use the private network.

The utility calculates the netmask for the minimum IP address range that will support the number of nodes, zone clusters, and private networks that you specified. The calculated netmask might support more than the supplied number of nodes, including non-global zones, zone clusters, and private networks. The scinstall utility also calculates a second netmask that would be the minimum to support twice the number of nodes, zone clusters, and private networks. This second netmask would enable the cluster to accommodate future growth without the need to reconfigure the IP address range.

The utility then asks you what netmask to choose. You can specify either of the calculated netmasks or provide a different one. The netmask that you specify must minimally support the number of nodes and private networks that you specified to the utility.

Note –

Changing the cluster private IP-address range might be necessary to support the addition of voting nodes, non-global zones, zone clusters, or private networks.

To change the private-network address and netmask after the cluster is established, see How to Change the Private Network Address or Address Range of an Existing Cluster in Sun Cluster System Administration Guide for Solaris OS. You must bring down the cluster to make these changes.

However, on the Solaris 10 OS the cluster can remain in cluster mode if you use the cluster set-netprops command to change only the netmask. For any zone cluster that is already configured in the cluster, the private IP subnets and the corresponding private IP addresses that are allocated for that zone cluster will also be updated.

If you specify a private-network address other than the default, the address must meet the following requirements:

See Planning Your TCP/IP Network (Tasks), in System Administration Guide: IP Services (Solaris 9 or Solaris 10) for more information about private networks.