Private Cloud vs Public Cloud

I was at All About the Cloud Summit at San Francisco last week and one of the most popular debate was when ISVs should choose Private Cloud vs Public Cloud for hosting their SaaS Application. These are the most common situations when Private Cloud might be most appropriate for the ISV

 - Significant existing Data Center Infrastructure

- Data can not go to outside Provider (Data Sovereignty Issues)

- Security Requirements can not be met by Public Provider

- Latency requirements can not be met by Public Provider

- Application Architecture does not meet requirements of Public PaaS Providers

In any case, the requirements from both Public and Private Clouds are the same -

- Allow ISV to meet Performance/ Availability SLAs while keeping Operations Cost Low

- Standards based Architecture so that Application/ Customer can move from Public to Private Clouds and vice versa