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Disaster Tolerance and Recovery in a Serviceguard Cluster
Understanding Types of Disaster Tolerant Clusters
Chapter 1 29
Benefits of Continentalclusters
• You can virtually build data centers anywhere and still have the data
centers provide disaster tolerance for each other. Since
Continentalclusters uses two clusters, theoretically there is no limit
to the distance between the two clusters. The distance between the
clusters is dictated by the required rate of data replication to the
remote site, level of data currency, and the quality of networking
links between the two data centers.
• In addition, inter-cluster communication can be implemented with
either a WAN or LAN topology. LAN support is advantageous when
you have data centers in close proximity to each other, but do not
want the data centers configured into a single cluster. One example
may be when you already have two Serviceguard clusters close to
each other and, for business reasons, you cannot merge these two
clusters into a single cluster. If you are concerned with one of the
centers becoming unavailable, Continentalclusters can be added to
provide disaster tolerance. Furthermore, Continentalclusters can be
implemented with an existing Serviceguard cluster architecture
while keeping both clusters running, and provide flexibility by
supporting disaster recovery failover between two clusters that are
on the same subnet or on different subnets.
• You can integrate Continentalclusters with any storage component of
choice that is supported by Serviceguard. Continentalclusters
provides a structure to work with any type of data replication
mechanism. A set of guidelines for integrating other data replication
schemes with Continentalclusters is included in the Designing
Disaster Tolerant HA Clusters Using Metrocluster and
Continentalclusters user’s guide.
• Besides selecting your own storage and data replication solution, you
can also take advantage of the following HP pre-integrated solutions:
— Storage subsystems implemented by CLX are also pre-integrated
with Continentalclusters. Continentalclusters uses the same
data replication integration module that CLX implements to
check for data status of the application package before package
start up.
— If Oracle DBMS is used and logical data replication is the
preferred method, depending on the version, either Oracle 8i
Standby or Oracle 9i Data Guard with log shipping is used to