HP (Hewlett-Packard) t2808-90006 Manuale Utente

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Building an Extended Distance Cluster Using Serviceguard and Software RAID
Chapter 2
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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: