Sun SPARC Enterprise M5000 Server
 

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In this Document

Goal

Solution

Created from <SR 3-6283910171>

Applies to:

Goal

The purpose of this document is to define 2+2 power redundancy,
provide instructions to correctly cable the M5000 for maximum power
redundancy, and provide a link to the proper documentation. 

Solution

On a M5000 server PSU redundancy is given as follows :

A) No redundancy
   Systems configured to use 100V AC have no redundancy.

    Example:  XSCF> showhardconf
        ........

        PSU#0 Status:Normal; Ver:303746h; Serial:FA14150164    ;
            + FRU-Part-Number:CA01022-0820  /7088114    ;
            + Power_Status:ON; AC:100 V; Type: B ;

        ........

B) PSU redundancy without DPF ( Dual Power Feed is disabled on XSCFU )

   Systems configured to use 200V AC, have 2+2 PSU redundancy. The system will continue
   to run with any two functional PSU's, regardless how they are connected to the AC power grids.
 
   If your using two independent power sources ( redundant power grids ) and have connected 2 PSU's
   to each of them, one of these AC power sources can be lost and system will stay up.

C) PSU redundancy with DPF ( Dual Power Feed is enabled on XSCFU )

   Systems configured to use 200V AC, have 2+2 PSU redundancy, but with restrictions. The system
   will continue to run with either PSU0+2 connected to AC power grid A or PSU1+3 connected to AC
   power grid B, if one of the redundant AC power sources is lost.  

   In terms of PSU redundancy this configuration is more restrictive because not any 2 PSU's can fail.
   Due to the mentioned DPF firmware feature the XSCFU prevents the system from continuing to run, if
   PSU0 or  PSU2, and  PSU1 or PSU3 are failing at the same time. The logic behind this is that a
   system should always have at least one functional PSU on each AC power source available regardless
   of PSU hardware fault and/or AC input fault.

   The system would have too little power if in addition to a double PSU failure ( PSU0 & PSU2 or PSU1 & PSU3 )
   one of the power sources is lost.

 To find out if DPF is set use the header of the full showhardconf output. 

  the value "Single" tells you no Dual Powerfeed  + Power_Supply_System:Single; SCF-ID:XSCF#0;

Remarks:
1. If we are speaking about DPF disabled or enable, we're referring to the appropriate XSCFU command.
   [ See the man page on XSCF:  setdualpowerfeed(8) - set dual power feed mode ].

2. The  recommended setup is having redundant AC power sources in the data center and the cabling
   configuration as described in the Installation Guide below:

   Please refer to SPARC Enterprise M4000/M5000 Servers, Installation Guide
   >>> FIGURE 2-4 on page 2-7 http://docs.oracle.com/cd/E19580-01/E26845/E26845.pdf

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