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Cluster topology and

Cluster topology andCluster topology and

Cluster topology and

geography with Cluster

geography with Clustergeography with Cluster

geography with Cluster

Extension XP

Extension XPExtension XP

Extension XP

The current maximum number of nodes supported is eight. A Quorum Service node is required to provide arbitration

to clusters in a CLX configuration. It provides arbitration services for the cluster when a cluster partition is discovered.

A node running the Quorum Service cannot be a member of any cluster to which it is providing cluster quorum

services.

The recommended configuration implements two data centers with the nodes of the cluster split equally between

them and a third site housing the Quorum Service.

The minimum supported configuration is two data centers, with one of the data centers housing the Quorum Service.

In this configuration, if the data center housing the Quorum Service is down, the nodes in the second data center will

not be able to form the cluster, as there is no quorum. At the minimum, the Quorum Service should be in a separate

room with its own power circuit.

The maximum distance between the data centers is currently limited either by the maximum distance supported for

the networking type or by the CA link being used, whichever is shorter-but no more than 100 kilometers.

DWDM (Dense Wave Division Multiplexing) device can be used for the network and data replication links to

increase the distance up to 100 kilometers between data centers.

Cluster networking links

Cluster networking linksCluster networking links

Cluster networking links

with Cluster Extension XP

with Cluster Extension XPwith Cluster Extension XP

with Cluster Extension XP

The supported network interfaces used for cluster heartbeat are 10Base-T and 100Base-T.

There must be less than 200 milliseconds of latency in the cluster heartbeat network between the data centers.

No routing is allowed for the cluster heartbeat network between the data centers.

There must be at least two alternately routed cluster heartbeat links between the data centers to prevent the

"backhoe problem". The "backhoe problem" can occur when all cables are routed through a single trench and a

tractor on a construction job severs all cables, disabling all communications between the data centers.

One of the heartbeat links has to be a dedicated link. The other heartbeat link can be shared with the application

network link.

Data replication

Data replicationData replication

Data replication

continuous access (CA)

continuous access (CA)continuous access (CA)

continuous access (CA)

links

linkslinks

links

There must be at least two alternately routed CA links between the two primary data centers.

NOTE:

NOTE: NOTE:

NOTE:

The maximum distance between the two primary data centers is currently limited either by the maximum distance

supported for the cluster networking type or by the CA link being used, whichever is shorter.

DWDM links for both

DWDM links for bothDWDM links for both

DWDM links for both

networking (cluster

networking (clusternetworking (cluster

networking (cluster

heartbeat and application

heartbeat and applicationheartbeat and application

heartbeat and application

network) and CA

network) and CAnetwork) and CA

network) and CA

The maximum distance supported between the data centers for a DWDM configuration is 100 kilometers.

Both the networking (cluster heartbeat and application network) and CA links can go through the same DWDM box.

A separate DWDM box is not required.

The fiber-optic links between the DWDM boxes must be "dark fiber" links, non-switched circuits. There must be two

alternately routed links between the two primary data centers.

For the highest availability, it is recommended to have two separate DWDM boxes (in each data center) used for

the links between each data center. However, since most DWDM boxes are typically designed to be fault tolerant,

it is acceptable to use only one DWDM box (in each data center) for the links between each data center. If a single

DWDM box is used, a minimum of one active and one redundant standby fiber link feature of the DWDM box must

be configured. When using ESCON for CA, note that the ESCON timeout is shorter than the DWDM link failover

time. Therefore, a minimum of two active fiber links on the DWDM box must be configured.

Quorum service

Quorum serviceQuorum service

Quorum service

With only one IP address configurable for a Quorum Service, it is suggested to configure the LAN used for the

Quorum Service IP address with two or more physical LAN cards using Channel Bonding to improve the availability of

the Quorum Service if a LAN card failure occurs. A node running the Quorum Service cannot be a member of any

cluster to which it is providing cluster quorum services.

The Quorum Service can provide arbitration services for up to 50 heteregenous clusters or 100 cluster nodes.

Recommended configuration with two data centers and the Quorum Server in a third location.

Recommended configuration with two data centers and the Quorum Server in a third location.Recommended configuration with two data centers and the Quorum Server in a third location.

Recommended configuration with two data centers and the Quorum Server in a third location.

QuickSpecs

HP Serviceguard for Linux ProLiant Cluster

Specifications

DA - 11518 Worldwide — Version 6 — September 5, 2003

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