Administrator's Guide

Configuring HyperFabric
Configuring HMP for Transparent Local Failover Support
Chapter 496
Configuring HMP for Transparent Local
Failover Support
HMP supports Local Failover in the HyperFabric version B.11.23.01.
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 like MPI can continue using HMP without local
failover support.
• HMP supports the local failover configuration in HyperFabric
version B.11.23.01.
• 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.