Serviceguard Extended Distance Cluster (EDC) with VxVM/CVM Mirroring on HP-UX, May 2008

Extended Distance Cluster Architecture
Architecture
Local Serviceguard clusters are implemented to reduce single points of failure (SPOF) by deploying
redundant nodes, network switches, storage switches in the cluster. This leaves the data center itself as
a SPOF when a disaster such as fire, flood, or a power outage occurs.
An EDC provides the ability to survive multiple points of failure, for example, failure of all components
of a single data center, by automatically resuming ongoing work with components in another data
center.
To build an EDC, you should design for local availability first, then multiply those components by two
and evenly distribute them between two data centers. Connect the two datacenters which include
redundant storage systems with redundant network and storage links between the two datacenters.
Configure volume manager mirroring as the data replication method to validate that each datacenter
has a complete copy of the data.
Tip:
Visit http://docs.hp.com/en/B7660-90020/B7660-90020.pdf
for the
document Understanding and Designing Serviceguard Disaster Tolerant
Architectures, which provides “Disaster Tolerant Architecture Guidelines”
among other useful information regarding Disaster Tolerance with HP
Serviceguard.
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