PrivateCloud 和 On-Premise

Private Cloud其含义为“Private cloud is cloud infrastructure operated solely for a single organization, whether managed internally or by a third-party, and hosted either internally or externally”，其关键是只为单一组织运作。

On-premises Software定义是指安装在个人和组织机器里面的软件，对应的off-premises software。On-Premise通常是指“software as a service” ("SaaS") or “cloud computing”，其中强调“on the premises (in the building) ”是指自有。

Private Cloud细分2类，分别是：On-Premise和Hosted：
On-Premise Private Cloud, often called Internal Cloud, is hosted within an organizations own offices, or data center, and provides an internal solution for hosting needs.
A hosted Private Cloud solution is owned and operated by third-party service providers.

从话术来看，公有云厂家站在卖服务的立场，更愿意把Private Cloud叫做“专有云”，其实就是Hosted Private Cloud，并希望为该组织提供第三方的运维服务。
而传统的设备厂家和软件厂家，更喜欢把Private Cloud叫做“私有云”，On-Premise Private Cloud，从而在强调“自有”的基础上更好的卖软件和硬件。