Some of my note are given below for reference.
What is a cloud ? Since you have cloud available, why clutter your brain ? You can store some of the brain memory is external private cloud and access it from your home and outside :)
I will not try to define cloud, Refer to National Institute of Standards and Technologies (NIST)'s cloud definition. A Cloud can be private, hybrid, community or public. A cloud should have On-Demand Self-Service, Broad Network Access, Resource Pooling,Rapid Elasticity and Measured Services. Virtualization is an enabling technology for cloud computing. Cloud has different service models such as IAAS (Infrastructure as a service), PAAS (Platform as a service) and SAAS (Software as a service)
Software as Service (Saas) means you don't need to install software in your laptop. My question is will it make my laptop lighter :)
vCenter is what manages vSphere virtual infrastructure hosts, virtual machines, and virtual resources (CPU, memory, storage, and network). You create software based VMClusters using Vcenter. You can VMotion across different VMClusters. VMWare admin uses Vcenter to manager your entire VMWare infrastructure. Some companies have seperate Vcenter for production and non-production environment for security reasons. You should be able to see and configure multiple datacenter in single Vcenter console. You can view utilization of your hosts (CPU, Memory etc) in Vcenter.
vCloud Director (VCD) is at a higher level in the cloud infrastructure. vCloud Director (vCD) can traverse multiple virtual infrastructures and further abstracts the virtual infrastructure resources into software-defined storage, networking, security, and availability. vCloud Director manages one or more vCenter instances for your private cloud.
To create a cloud you’ll need both vCenter and vCD, however most organization has only vCenter.VCD communicate to Vcenter to create abstration.
vSphere is a software suite that has many software components like vCenter, ESXi, vSphere client and so on. vSphere is not a software that you can download and install. This is a combination of different products. ESXi is the virtualization server - type 1 hypervisor. All virtual machines or Guest OS are installed on ESXi server. vSphere client is used to access vCenter Server and used for manage ESXi servers.
vRealize Orchestrator (VCO) provide workflow and automation capabilities. If you are using VCO, then you may not need vRealize Automation (formerly vCloud Automation Center).
Not sure why VMware renamed vcloud to vRealize ? Is it a good idea to build your own cloud or buy ? The cloud providers like Amazon EC2 is not cheap. It is very expensive. I created an account earlier using my credit card. Created couple of VM's and installed few Middleware software on it. I realized that Amazon was charging my credit card. Some how I noticed it lately !
Public cloud is a good idea if you need to ramp up and down your infrastructure unpredictably or need elasticity on your existing data center based on consumer traffic.
More to follow .......