How many nodes can be had in an HP-UX/Solaris/AIX/Windows/Linux cluster?

The number of nodes supported is not limited by Oracle, but more generally by the clustering software/hardware in question. When using solely Oracle Clusterware: 63 nodes (9i or 10gR1) With 10g Release 2, the maximum nodes is 100 When using a third party clusterware: Sun: 8 HP UX: 16 HP Tru64: 8 IBM AIX: * 8 nodes for Physical Shared (CLVM) SSA disk * 16 nodes for Physical Shared (CLVM) non-SSA disk * 128 nodes for Virtual Shared Disk (VSD) * 128 nodes for GPFS * Subject to storage subsystem limitations Veritas: 8-16 nodes (check w/ Veritas) Is it possible to run RAC on logical partitions (i.e. LPARs) or virtual separate servers.

Yes, it is possible. The E10K and other high end servers can be partitioned into domains of smaller sizes, each domain with its own CPU(s) and operating system. Each domain is effectively a virtual server.

RAC can be run on cluster comprises of domains. The benefits of using this is similar to a regular cluster, any domain failure will have little effect on ... more.

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