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

Figure 3. Two-data center Extended Cluster for RAC—up to 100 km currently-supported configuration
Test architecture
The test configuration for the 100-km evaluation followed the supported configuration for all
subsequent SGeRAC implementations.
Supported hardware configuration
• Two-node cluster (PA-RISC or HP Integrity servers, not mixed).
– A two-, four-, six- or eight-node cluster is supported up to 10 km with VERITAS Cluster Volume
Manager (CVM).
• Redundant heartbeat, plus one or two LANs for Cache Fusion traffic.
– Clusters with VERITAS CVM; only single-heartbeat subnet is supported (use primary/standby
LANs).
• Any Fibre Channel storage (using HP StorageWorks Virtual Array (VA), HP StorageWorks XP disk
array, HP StorageWorks Enterprise Virtual Array (EVA), or just a bunch of disks (JBOD)
technologies).
– Note: EVA disk arrays do not currently support VERITAS Volume Manager (VxVM)/CVM.
• Both TCP/IP networking and Fibre Channel data can go through the same DWDM box; redundant
DWDM boxes in each data center are not required if the box is designated as acceptably fault-
tolerant.
• At least two dark fiber links between data centers.
– During testing, AT&T-supplied dark fiber optic links were used between data centers (to further
enhance disaster tolerance capabilities, alternate physical routes can be added to remove single
points of failure).
– Note: TCP/IP networking and Fibre Channel data pass through the same DWDM box; in a non-
test environment, redundant DWDM boxes in each data center are not required if fault-tolerant
design specifications meet disaster tolerance requirements.
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