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OVM tips

原创 Linux操作系统 作者:mambo_shen 时间:2009-09-11 12:15:23 0 删除 编辑

– 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.

 

http://hzovm.mambo.com:8888/OVS          https://hzovm.mambo.com:4443/OVS

 
Oracle VM Virtual Machine (VM) guests can be configured to use three virtualisation modes:
  • Hardware Virtualised or Fully Virtualised (HVM)
  • Paravirtualised (PVM)
  • Hardware Virtualised using Paravirtualised Drivers (PVHVM)

1. Hardware Virtualised (HVM)

  • Oracle VM Server hardware (processor) must support virtualisation e.g. Intel VT-x, AMD SVM/AMD-V
  • Hardware virtualisation feature must exist and be enabled in the system BIOS

2. Paravirtualised (PVM)

  • Oracle VM Server hardware (processor) may, but need not, support virtualisation e.g. Intel VT-x, AMD SVM/AMD-V
  • Where available, hardware virtualisation need not exist, nor be enabled in the system BIOS

3. Hardware Virtualised using Paravirtualised Drivers (PVHVM)

       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.

  • Oracle VM Server hardware (processor) must support virtualisation e.g. Intel VT-x, AMD SVM/AMD-V
       Hardware virtualisation must exist and be enabled in the system BIOS

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