Configuring HyperFabric

Configuring HMP for Transparent Local Failover Support

 

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

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Chapter 4

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HP HyperFabric manual Configuring HMP for Transparent Local Failover, Support