Note: The follow sections requires going through code and study the mentioned classes.
ServerResource ServerResourceBase VirtualRouterDeployer CommandWrapper
LibvirtComputingResource, KvmServerDiscoverer/LibvirtServerDiscoverer
CitrixResourceBase, XenServerResourceNewBase, XcpServerDiscoverer
VmwareResource VmwareServerDiscoverer VmwareHostService
How cloudstack orchestrates, programs hypervisor cmd-answers
TOs (transfer objects), service layer -> hypervisor (serverresource)
https://cwiki.apache.org/confluence/display/CLOUDSTACK/Storage+subsystem+2.0
StorageProcessor StoragePoolResource StorageSubsystemCommandHandler
SecondaryStorageResource LocalSecondaryStorageResource NfsSecondaryStorageResource PremiumSecondaryStorageResource SecondaryStorageDiscoverer
Focus on NFS, how SSVM+NFS works, mount/unmount/copy/delete etc, use of apache2
AgentRoutingResource SimulatorDiscoverer SimulatorSecondaryDiscoverer