Section 6- Adapter Information

List all SCI adapters in the cluster and describe the connection details for each.

Use a separate line for each adapter description. The format for describing unswitched connections is

host n :: adp n is connected to = link
n :: endpt n

When no switch is used, an adapter (adp) is connected to a particular endpoint (endpt n) on a particular channel (link n). See Figure 3-2 and Figure 3-3.

Each adapter has its own endpoint. That is why two different endpoints are shown on one link.

Figure 3-2 Two-Node Nonstriped Configuration

Figure 3-3 Two-Node, Striped Configuration

The format for describing switched connections is slightly different.

host n :: adp n is connected to = switch
n :: port n

Here, an adapter is connected to port n of switch n. Figure 3-4 through Figure 3-7 show examples of this format.

Figure 3-4 Three-Node, Nonstriped Configuration

Figure 3-5 Three-Node, Striped Configuration

Figure 3-6 Four-Node, Nonstriped Configuration

Figure 3-7 Four-Node, Striped Configuration

Adapter ID values are assigned automatically by the device driver. Initially, the device driver assigns ID 0 to the adapter installed in the lowest-numbered SBus slot, ID 1 to the adapter in the next higher-numbered slot, and so forth. ID value assignments are always consecutive, even if the adapters are not installed in adjacent slots. Consequently, if adapter cards are not installed in adjacent slots, adapter ID values do not necessarily correspond to SBus slot numbers.

Once an ID value is assigned, it will not be reassigned, even if the adapter to which it was originally assigned is removed.

Because a ID values do not necessarily correspond to SBus slot numbers, the adp n values that you assign in the sci_config.hpc file may not match the actual ID assignments made by the device driver. For this reason, you may need to revise this adapter connection description (that is, the contents of Section 7) to match the actual adapter connections.

This is why you were advised to make the temporary map of the physical network layout. Instructions for ensuring that the sci_config.hpc file matches the actual adapter ID values are provided in "Compare sm_config Output With Contents of sci_config.hpc"