Issue of Huawei V3 unified storage!

V3 unified storage controller under multi-controller architecture:

• The san module (software module) should be an instance of each controller running, so can these instances be able to perform parallel processing (slua) of the IO of the same LUN, and can it be a "global cache"?
  

• Is it the same with NAS?
  

• Does NAS support global namespace?
  

• What is the access mechanism of nfs and cifs protocols for the same file in the same shared volume? Is it the method of user mapping?
  

• When doing raid2.0, does the disk domain support cross-controller pairs?
  

• When doing controller management tasks (such as creating a lun, mapping a lun, etc.), how to achieve coordination between multiple controllers?

Thanks