PRIMECLUSTER Cluster Foundation Configuration and Administration Guide 4.5

6.3 Examples

The following examples show various network configurations and what their topology tables would look like when the topology table is displayed in the CF Wizard on a totally unconfigured cluster. For simplicity, the check boxes are omitted.

Example 1

In this example, there is a three-node cluster with three full interconnects.

Figure 6.1 A three-node cluster with three full interconnects

The resulting topology table for the figure above is shown in the table below.

Table 6.3 Topology table for 3 full interconnects

FUJI	Full interconnects
	Int 1	Int 2	Int 3
fuji2	hme0	hme1	hme2
fuji3	hme0	hme1	hme2
fuji4	hme0	hme1	hme2

Since there are no partial interconnects or unconnected devices, those columns are omitted from the topology table.

Example 2

In this example, fuji2's Ethernet connection for hme1 has been broken.

Figure 6.2 Broken Ethernet connection for hme1 on fuji2

The resulting topology table for the figure above is shown in the table below.

Table 6.4 Topology table with broken Ethernet connection

FUJI	Full interconnects		Partial interconnects	Unconnected devices
	Int 1	Int 2	Int 3
fuji2	hme0	hme2	missing	hme1
fuji3	hme0	hme2	hme1
fuji4	hme0	hme2	hme1

In "Table 6.4," hme1 for fuji2 now shows up as an unconnected device. Since one of the interconnects is missing a device for fuji2, the Partial Interconnect column now shows up. Note that the relationship between interconnect numbering and the devices has changed between "Table 6.3" and "Table 6.4". In "Table 6.3," for example, all hme1 devices were on Int 2. In "Table 6.4," the hme1 devices for Nodes B and C are now on the partial interconnect Int 3. This change in numbering illustrates the fact that the numbers have no real significance beyond the topology table.

Example 3

This example shows a cluster with severe networking or cabling problems in which no full interconnects are found.

Figure 6.3 Cluster with no full interconnects

The resulting topology table for the figure above is shown in the table below.

Table 6.5 Topology table with no full interconnects

FUJI	Partial interconnects			Unconnected devices
	Int 1	Int 2	Int 3
fuji2	hme0	missing	hme2	hme1
fuji3	missing	hme1	hme2	hme0
fuji4	hme0	hme1	missing	hme2

In this table, the full interconnects column is omitted since there are none. Note that if this configuration were present in the CF Wizard, the wizard would not allow you to do configuration. The wizard requires that at least one full interconnect must be present.