User's Guide

Conﬁguring HyperFabric

Conﬁguring HMP for Transparent Local Failover Support

Chapter 4

Conﬁguring HMP for Transparent Local Failover

Support

HMP supports Local Failover on HP-UX 11i v3.

If a HyperFabric resource (adapter, cable, switch or switch port) fails in a cluster, HMP

transparently fails over trafﬁc (Local Failover) using another available resource from the

card pair. A card pair can be deﬁned as a logical entity comprising of a pair of HF2

adapters on a HP 9000 node. For example, if there are four HF2 adapters installed and

conﬁgured in a node, then there would be two card pairs.

IMPORTANT Remember the following points while conﬁguring HMP for Local Failover support:

• Only Oracle applications can make use of the local failover feature. Other

middleware can continue using HMP without local failover support.

• HMP supports the local failover conﬁguration from HyperFabric version B.11.11.03.

• All nodes in the cluster need to be conﬁgured either in the local failover mode or the

non-local failover mode. While using clic_init, if you answer ‘y’ to the question, “Do

you want to conﬁgure Local Failover on this node?”, then you have conﬁgured HMP

for the local failover mode. Otherwise, your HMP conﬁguration is for the non-local

failover mode. Do not mix these two modes. For any incorrect conﬁgurations, HP

recommends that you clic_shutdown and clic_start the cluster.

• The Transparent Local Failover feature over HMP is supported only in a

switch-based environment. If two nodes are connected through multiple

point-to-point links, local failover cannot be achieved.

• There must be even number of HF2 adapters on any given node, and all adapters

installed must be conﬁgured. In addition, all the adapters must belong to a card pair.

• HMP can fail over trafﬁc only between adapters that belong to the same card pair.

• HMP does not support backward compatibility in the local failover and non-local

failover mode. However, TCP/UDP/IP supports backward compatibility and

interoperability.

• When HMP is conﬁgured in the local failover mode, all the resources in the cluster

are utilized. If a resource fails in the cluster and is restored, HMP does not utilize

that resource until another resource fails.

• Before running clic_start on all the nodes in the cluster, ensure that all the conﬁgured

cards are connected in the cluster. In other words, before running the clic_start

command, verify that all the cables are connected to the adapters and switches.

• If a resource in the cluster fails and is restored, perform the following steps to ensure

full utilization of that resource:

— Shutdown Oracle RAC

— Execute the clic_shutdown command

— Execute the clic_start command

— Restart Oracle RAC