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HP Extended Cluster for RAC Continuous availability with the flexibility of virtualization

ManualsBrandsHP ManualsSoftwareHP Serviceguard Extended Distance Cluster
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Conclusions
HP has successfully shown the viability of the Extended Cluster for RAC in a virtualized environment
over distance. In particular, HP demonstrated the feasibility of a SGeRAC configuration deployed
across two discrete data centers separated by 100 km. The 100-km distance significantly diminishes
the likelihood of a single disaster impacting more than one data center at any one time.
Traditionally, disaster tolerance in an IT environment had been accomplished through a configuration
of “active/standby”, that is, resources are not utilized until needed. The 100-km RAC solution destroys
this paradigm—there is now full utilization of all resources in all data centers at all times, that is, an
“active/active” environment. Data is replicated between the two data centers and is fully
synchronized, allowing location-independent access to the applications. The HP VSE permits both
data centers to see the data simultaneously and to leverage the aggregated resources from both
locations continuously. The HP VSE is the only solution available on the market today that tightly
integrates high availability, partitioning, and utility pricing.
HP is thus able to deliver a highly reliable solution incorporating SGeRAC, the VSE, BEA WebLogic
Server, and Oracle9i RAC. The refinement of VSE technologies makes possible the full utilization of IT
resources beyond 100 km as well.
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The leadership of HP in virtualization technologies ensures that
full resource utilization will soon become mainstream, regardless of the distance separating data
centers.
HP has thus made extending a RAC solution a reality without sacrificing resource efficiency.
References
DWDM: A White Paper by Joseph Algieri and Xavier Dahan, available on request from HP
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HP Continentalclusters for RAC is available for customers requiring a solution that extends beyond 100 km and incorporates the features of
extended RAC across two data centers located anywhere in the world.