A new white paper from Oracle's Elite Engineering Exchange team provides an excellent guide to the different virtualization technologies available on SPARC platforms, including guidance on when to employ each - either alone, or in combination with another technology. PDoms, LDoms, and different flavors of Solaris Zones are evaluated in terms of
Although the paper is not specific to database deployments, the key points apply to all workload tiers. And while the discussion is on SPARC technologies, many points apply to all virtualization technologies. For example, from our DBaaS perspective, the following quote from the paper couldn't say it better:
"When a traditional monolithic virtualization approach is taken where machines are mapped one-to-one to virtual machines, there is no overall reduction in the operational complexity of the system, because there are still the same number of entities to be managed ... the aim should be to consolidate workloads, not simply to consolidate machines, because it is workload consolidation that will drive the operational efficiencies of the data center."
This summary from the paper shows the full scope of the discussion - the paper looks at each of these rows in detail, and finishes with an evaluation of the combinations that make sense (and when they are indicated). Great reading for anyone looking to consolidate workloads onto SPARC platforms.