IBM p570 在线更换电源模块

今天有个p570电源模块发现后面的风扇声音很大，估计电源快挂了，打算提前给换了，之前更换都是电源失效后通过HMC管理和维护事件一步一步更换的，网上找到方法大家给点意见：
Model 9116-561 or 570 power supply

Learn how to remove and replace the power supply.

Attention: In order to use the power on procedure for this model you must check to see if you have one of the following adapters installed in slot P1-C6/C7. FC 1800 - HSL-2 Ports - 2 Copper FC 1801 - HSL-2 Ports - 2 Optical FC 1810 - GX Dual-port 4x HCAIs one of these adapters present in slot P1-C6/C7? Yes: Check for a label by the slot that indicates specifically that power supply concurrent maintenance is supported. If there is no label you must select the power off procedure to prevent system damage or data loss. If there is a label you can continue with the power on procedure.No: you can continue with the power on procedure.
Replace the model 9116-561 or 570 power supply with power on

Learn how to replace the power supply with the system power on.

The following procedure describes the replacement of the power supply while the system power is on. Attention: Two power supplies must be present in the system to power on the system unit. If one power supply fails, or you have a system failure that does not stop the fans, the system will continue to operate. You can remove and replace the power supply with the system power on if it is done in less than 5 minutes. After 5 minutes, the system will power off to prevent the system from overheating.


Exchange a part using the HMC Version 7 In the navigation area, expand Systems Management. Expand Servers. Select the managed system in which you are exchanging a part. In the Tasks area expand Serviceability. Expand Hardware. Select Exchange FRU. In the Replace Hardware - Replace FRU, Select FRU Type window select the system or enclosure in which you will exchange a part from the list. Select the type of part you will exchange from the menu and click Next. Select the location code of the part you will exchange from the menu and click Add.
http://publib.boulder.ibm.com/infocenter/powersys/v3r1m5/index.jsp?topic=/iphbd_p5/hmcreplace.htm

现在有个问题 我要更换的电源模块的FRU号我怎么能知道呢，电源模块的FRU号都是一样的

它的位置我是知道的，比如说Location: U7879.001.DQDGHYX-E2。

还有，上面的除外我还应该注意些什么