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Building an Extended Distance Cluster Using Serviceguard and Software RAID
Chapter 2 51
2 Building an Extended Distance
Cluster Using Serviceguard and
Software RAID
Simple Serviceguard clusters are usually configured in a single data
center, often in a single room, to provide protection against failures in
CPUs, interface cards, and software. Extended Serviceguard clusters are
specialized cluster configurations, which allow a single cluster to extend
across two separate data centers for increased disaster tolerance.
Depending on the type of links employed, distances of up to 100 kms
between data centers can be achieved.
This chapter discusses several types of extended distance cluster that
use basic Serviceguard technology with software mirroring (using MD
Software RAID) and Fibre Channel. Both two data center and three data
center architectures are illustrated. This chapter discusses the following:
• “Types of Data Link for Storage and Networking” on page 52
• “Two Data Center and Quorum Service Location Architectures” on
page 53
• “Rules for Separate Network and Data Links” on page 57
• “Guidelines on DWDM Links for Network and Data” on page 58