OID have 2 different batch where by the device using same model,Power ,BBU,FUN,as below
OID is an interface ,Customers can access device status or set device status through OID
thereason why the OID for BBU and FAN is not the same is that;
The storage have 2 controllers, the BBUs and FANs are shared by the two controllers.
Each time the OID is got from one of the controllers(which controller , it is determined when the controller is started ).
Get from different controller, the OID is different for BBU and FAN.
But there is no any influence to get the values of the BBUs and FANs and Power.