ServerNet Cluster Manual

Installing and Configuring a ServerNet Cluster
ServerNet Cluster Manual—520575-003
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Task 10: Check for Problems
Rules for Configuring Line-Handler Processes Using SCF
If you use SCF to configure Expand-over-ServerNet line-handler processes manually
(in other words, you do not use the guided procedure), observe the following
configuration rules:
To Learn More About Expand-Over-ServerNet Line-Handler Processes
For more information about configuring Expand-over-ServerNet line-handler
processes, refer to Section 1, ServerNet Cluster Description, or the Expand
Configuration and Management Manual.
Task 10: Check for Problems
You can quickly verify the health of each node you have added to a ServerNet cluster
by using the OSM Service Connection or TSM Service Application. If you find
problems, HP recommends that you resolve the problems before adding new nodes to
the cluster.
1. Using a system console connected to the system you added, log on to the system
using the OSM Service Connection or TSM Service Application. For more
information about logging on, refer to Appendix F, Common System Operations.
2. In the tree pane of the management window, click the Cluster tab (or the Cluster
object in the OSM Service Connection).
Rule 1 Whenever possible, configure the primary and backup Expand-over-
ServerNet line-handler processes in different processor enclosures. This rule
applies to all systems except for two-processor systems, which have only one
processor enclosure. Rule 1 takes precedence over Rules 2 and 3.
Rule 2 Whenever possible, avoid configuring Expand-over-ServerNet line-handler
processes in processors 0 and 1. Key system processes, such as $SYSTEM,
can run only in processors 0 and 1. By reducing the number of processes
using processors 0 and 1, you can minimize the risk of key system processes
undergoing a software halt.
Because Rule 1 takes precedence over Rule 2, Rule 2 can be applied only in
systems having three or more processor enclosures. In a system with two
processor enclosures, the line-handler process pair must be configured
following Rule 1. Therefore, either the primary or the backup must run in
processor 0 or 1.
Rule 3 Whenever possible, avoid configuring Expand-over-ServerNet line-handler
processes on processors 8 through 15. These processors form the outer
tetrahedron of the Tetra 16 topology. There are more ServerNet components
(routers and links) along the paths from these processors to the external
fabrics than along the paths that originate in the inner tetrahedron
(processors 0 through 7). Consequently, these paths have a higher probability
of failing as a result of hardware faults.