Data Center (DC):
It is the logical entity which consists of different clusters .. Clusters are made by number of hypervisors.. You can have more than 1 cluster in a DC.
As mentioned Cluster built by group of hypervisors.. The cluster has to be defined for a particular ‘processor’ type. For ex: You can not mix INTEL and AMD hypervisors in the same cluster as of now.
RHEL or RHEV- hypervisor :
RHEV-M ( RHEV Manager) :
You got the answer from above URL.
The service running on RHEL or RHEV-Hypervisor which talks to RHEV Manager . This service listens on port 54321.
rhevm or jboss service :
The main service running on RHEV manager..
STORAGE DOMAIN :
This is the shared storage in a RHEV setup where Virtual Machines are hosted.. There are different protocols supported in a RHEV environment to create a storage domain.. NFS/ISCSI/FC ..etc.. When you create a storage domain there is a volume group created ( in case of FC/ISCSI) with NFS it is a file ..
STORAGE POOL MANAGER: ( SPM)
In simple terms, there should be one server who controls access to the common/shared storage . The SPM server do this job. There should be only one SPM per DC. Any of the active host can be elected as a SPM server..
I am putting “.” Here.. Let me know if you need anything need to be expanded or explained..