Administrator's Guide

Planning the Fabric

TCP/UDP/IP

Chapter 2 15

— Logging into a user speciﬁed log ﬁle with a choice of severity

— Email to a user deﬁned email address.

For more information on EMS, including instructions for

implementing this feature, see “Conﬁguring the HyperFabric EMS

Monitor” on page 85 and the EMS Hardware Monitors User’s Guide

Part Number B6191-90028 September 2001 Edition.

• ServiceGuard: Supported

Within a cluster, ServiceGuard groups application services

(individual HP-UX processes) into packages. In the event of a single

service failure (node, network, or other resource), EMS provides

notiﬁcation and ServiceGuard transfers control of the package to

another node in the cluster, allowing services to remain available

with minimal interruption.

ServiceGuard via EMS, directly monitors cluster nodes, LAN

interfaces, and services (the individual processes within an

application). ServiceGuard uses a heartbeat LAN to monitor the

nodes in a cluster. ServiceGuard cannot use the HyperFabric

interconnect as a heartbeat LAN. Instead, use a separate LAN for

the heartbeat.

For more information on conﬁguring ServiceGuard, see “Conﬁguring

HyperFabric with ServiceGuard” on page 87, and Managing

MC/ServiceGuard Part Number B3936-90065 March 2002 Edition.

• High Availability (HA): Supported

To create a highly available HyperFabric cluster, there should not be

any single point of failure. Once the HP 9000 nodes and the

HyperFabric hardware have been conﬁgured with no single point of

failure, ServiceGuard and EMS can be conﬁgured to monitor and fail

over nodes and services using ServiceGuard packages.

If any HyperFabric resource in a cluster fails (adapter card, cable or

switch port), the HyperFabric driver transparently routes trafﬁc over

other available HyperFabric resources with no disruption of service.

The ability of the HyperFabric driver to transparently fail over trafﬁc

reduces the complexity of conﬁguring highly available clusters with

ServiceGuard, because ServiceGuard has to take care of node and

service failover only.