User's Guide

Configuring HyperFabric
Configuring HMP for Transparent Local Failover Support
Chapter 4
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• After executing the clic_start command on all node in the cluster, ensure that you
run Oracle RAC only after one minute (approximately).
• If all the trunks between the switches are down, then execute clic_shutdown followed
by clic_start on all the nodes in the cluster, after replacing at least one trunk between
the switches.
• Maintain at least one trunk between the switches when Oracle RAC is running in
the cluster.
• If any of the nodes is shut down for administrative reasons, shut down Oracle RAC
before executing clic_shutdown on that node. In such a case, Oracle RAC continues to
be operational on all the other nodes in the cluster. When you bring up the node that
was shut down, it joins the cluster.
How Transparent Local Failover Works
Consider a hypothetical HyperFabric configuration in a 4-node cluster, with each node
having two adapters (see Figure 4-6). In this configuration, there is no single point of
failure, and all adapters that are installed on any given node are configured as part of a
card pair.
Figure 4-6 A Configuration supporting Local Failover
HF
adapter 1
node C
HF
adapter 0
HF
adapter 1
HF
adapter 1
HF
adapter 0
HF Switch 0
HF Switch 1
HF
adapter 1
node A
node B
node D
HF
adapter 0
HF
adapter 0
{
{
{
{
Card Pair 0
Card Pair 0
Card Pair 0 Card Pair 0