IBM-AUSTRIA - PC-HW-Support    30 Aug 1999

MULTIPLE DDD DRIVES caused by INCORRECT CHANNEL MAPPING

     Record number:       H093980
     Device:              D/T8640
     Model:               M
     Hit count:           UHC00000
     Success count:       USC0000
     Publication code:    PC50
     Tip key:
     Date created:        O98/06/03
     Date last altered:   A98/08/07
     Owning B.U.:         USA



Abstract: MULTIPLE DDD DRIVES caused by INCORRECT CHANNEL MAPPING

SYMPTOM:

After one drive becomes DDD, one or more other drives will appear to be in a DDD drive state.

PROBLEM ISOLATION AIDS:

All of the following must be true for this TIP to apply:

•  The System is any model PC Server Type 8640, 8641, 8642, 8650, 8651, that supports and is  configured with a Type II or a Type III Hot Swap backplane(s) AND / OR has a attached external  enclosure Type 3518.
•  The System is configured one of the following Adapters / Controllers that supports the  internal Hot-swap Bays and / or external enclosure(s) listed above:

      ServeRAID Adapter             FRU  P/N 06H9334
                                    Opt. P/N 70G8489
      ServeRAID Adapter             FRU  P/N 76H6875
                                    Opt. P/N 70G8489
      ServeRAID II Adapter          FRU  P/N 76H3587
                                    Opt. P/N 76H3584
      ServeRAID II Onboard Controller  (Integrated)

•  System Diagnostics pass.
•  ServeRAID / ServeRAID II diagnostics pass.

FIX:

NOTE: All further references to "Bank" or "Banks" represents those internal to the System and / or those located in a System-connected External Enclosure.

Ensure the Channel-bank mapping correctly reflects the SCSI cabling of the ServeRAID / ServerRAID II Adapter / Controller to the Hot-Swap backplane(s) as follows:

1.  Examine and NOTE the actual SCSI cabling of the ServeRAID / ServeRAID II Adapter / Controller  to the internal Hot-Swap backplane(s) internal to the System and / or in the System-connected External Enclosure.

    EXAMPLE:

                Ch1 on the ServeRAID goes to Bank E
                Ch2 on the ServeRAID goes to Bank D
                Ch3 on the ServeRAID goes to Bank C
    

2.  Ensure the ServeRAID / ServeRAID II Adapter / Controller is configured to map the SCSI Channels  (the same as the physical cabling) using the following procedure:
   •  Boot the System to the "IBM ServeRAID and ServeRAID II diskette"
   •  Choose option 7 "Advance Functions"
   •  Choose option 8 "Display/Change Adapter Params"
   •  Choose option 5 "Set Channel -> Bank Mapping" Using the same example (as in step 1),  the Channel-Bank mapping should be set as follows:

           +-----------------------------------------------------------+
           |                 CHANNEL -> BANK MAPPING                   |
           |-----------------------------------------------------------|
           |     |  LOW ID     HIGH ID    LOW(REVERSE)    HI (REVERSE) |
           |-----|-----------------------------------------------------|
           | CH1 |   :E                                                |
           |-----|-----------------------------------------------------|
           | CH2 |   :D                                                |
           |-----|-----------------------------------------------------|
           | CH3 |   :C                                                |
           +-----------------------------------------------------------+
      

   •  Ensure the Channel-Bank Mapping reflects the actual physical SCSI cabling (as was NOTED in step 1).

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