Cloud Computing market Structure (updated version)
It seems that the Cloud Computing Market structure has slightly changed since July 2009 when I tried for the first time to summarize it. In particular the Infrastructure As A Service (IAAS) segment.
Looking to Service Providers portfolio, a new sub segment has emerged, often called “Hosted Cloud” or “Virtual Data Centre”. So now we have:
- a Public Cloud -> fully shared (multi tenant) infrastructure, really flexible (pay per use), cheap, but with some limitations (ACL based security, no access to security logs, no value added services like backup, archiving or application management ..).
-a Private Cloud -> fully dedicated solution (one cloud per customer/project). Value added services are often available (security solutions, backup services, GSLB…), but it can be expensive for non critical applications ; and provisioning can be slow compared to other kinds of clouds.
- an Hosted Cloud (or Virtual Data Center) -> trying to mix Public and Private strengths. The underlying infrastructure is shared (Data Centre, physical servers…) but the resources rented are dedicated (CPU, memory…). Hosted Cloud includes rapid provisioning (auto provisioning of Virtual Machines, resource pool can be dynamically resized…) and can be combined with value added services and custom SLAs.
Cloud is not a revolution, it’s an evolution. Virtualization is not a new technology, the cloud risks are the same as any outsourcing project (how do I migrate my application? How can I get out? Who is responsible for what?…). The evolution is focused on delivering outsourcing services (based on Virtualization technology) that have a more flexible business model (pay per use), and more automated tools to allow IT teams to get more control of the Infrastructure.
But still, there is a lot of buzz around “Cloud” so here is my understanding of the Cloud/IAAS market structure :



