– Server Pool Master function
The Server Pool Master is the core of the server pool operations. It acts as the contact point of the server pool to the outside world, and also as the dispatcher to other servers within the server pool. The load balancing is implemented by the Server Pool Master. For example, when you start a virtual machine, the Server Pool Master will choose a Virtual Machine Server with the maximum resources available to run the virtual machine.There is only one Server Pool Master in a server pool.
– Utility Server function
The Utility Server is responsible for I/O intensive operations such as, copying, or moving files. Its function focuses on the creation and removal operations of virtual machines, servers, and server pools. There can be one or more Utility Servers in a server pool. When there are several Utility Servers, the Server Pool Master chooses the Utility Server with
the maximum CPU resources available to conduct the task.
– Virtual Machine Server function
The primary function of the virtual machine server is to run virtual machines, thus acting as a hypervisor. Oracle VM Agent is set up on the Virtual Machine Server to establish communication between the Server Pool Master, other Utility Severs, and Virtual Machine Servers. There can be one or more Virtual Machine Servers in a server pool. When there are several Virtual Machine Servers, the Server Pool Master chooses the Virtual Machine Server with the maximum resources available (for example, memory) to start and run the virtual machine.
PVHVM guests employ a mixture of both Hardware (HVM) and Paravirtualised (PVM) guest virtualisation modes. Starting out hardware virtualised, guests are reconfigured to make use of optimised paravirtualised drivers that help overcome some of the performance overhead of running a pure HVM configuration.
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