When comparing SmartDataCenter vs CloudStack, the Slant community recommends SmartDataCenter for most people. In the question“What are the best private cloud solutions?” SmartDataCenter is ranked 2nd while CloudStack is ranked 7th. The most important reason people chose SmartDataCenter is:
SmartDataCenter is an open source project. It's also hosted on [GitHub](https://github.com/joyent/sdc).
Ranked in these QuestionsQuestion Ranking
Pros
Pro Open Source
SmartDataCenter is an open source project. It's also hosted on GitHub.
Pro Based on SmartOS
SmartOS offers ZFS, Zones, DTrace and more that make for an excellent foundation as a cloud hypervisor.
Pro Open source
Cons
Con Unreliable
CloudStack can be unreliable for a variety of reasons. The common deployment recommendations (using centralized network storage instead of local storage) can lead to outages.
Furthermore, to do network isolation each hypervisor uses a dedicated routervm - these can have many issues (besides beeing bottlenecks) like dropping routes or completely freezing.