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ECA001, 320/720 SCSI CABLE REPLACEMENT TO SUPPORT CDROM



Subject: ECA001, 320/720 SCSI CABLE REPLACEMENT TO SUPPORT CDROM
(Updated PC Server RETAIN ECA001: 

     Record number:       H132199
     Device:              D/T8642         Service code:      33
     ECA number:          ECA001          Parts source:
     EC number:           EC000000        Publish flag:      R
     Mandatory:           N               Hit count:         UHC00448
     Automatic shipment:  N               Success count:     USC0000
     Availability date:   96/01           Publication code:  PC50
     Plant of control:    27              Date created:      O96/01/15
     Tip key:                             Date last altered: A98/05/11
                                          Owning B.U.:       USA


Abstract: ECA001, 320/720 SCSI CABLE REPLACEMENT TO SUPPORT CDROM

PURPOSE:

------------- Note: This ECA expires September 3, 2002----------

This ECA provides SCSI cables to replace the existing SCSI cable shipped in a limited number of Server 720 (8642) Systems OR PC Server 320 (8640) EISA/PCI Systems configured with a Hot-Swap Bay Option and at least one 16 bit SCSI Drive.

The new cable(s) eliminate a potential cause of intermittent read errors and general failures when reading from a 8 bit SCSI device during periods of high activity on the SCSI channel.

   FEATURES:
   Type,                  Machines Affected
   Model,   With          and/or Feature/Device     B/M to be    Service  Syste
   Stage    B/M           Description               Installed    Hours    Hours
   8642     B/M0000000    PC SERVER 720             B/M0000000   00.5     00.3
                          MODELS 0Z0, 1Z0, 2ZS,
                          AND 4ZS, MFG. BEFORE
                          12/12/95.
                          (MFG DATE: 512)
   8640     B/M0000000    PC SERVER 320             B/M0000000   00.5     00.3
                          MODELS 0X*, 0Y*, 1Y*
                          WITH HOT-SWAP BAY.


PHYSICAL CHECK:

Affected Systems are PC Server 720 Type 8642 model 0Z0, 1Z0, 2ZS, 4ZS manufactured in 1995, utilizing a SINGLE Multi-connector SCSI Cable (FRU P/N 06H6661 or 06H6675) and PC Server 320 Type 8640 model 0Xx, 0Yx, 1Yx configured with a Hot-Swap Bay Option utilizing a SINGLE Multi-connector SCSI Cable (FRU P/N 06H6876), and at least one 16-bit SCSI Hard Drive.

PC Server 720 and 320 Systems with the TWO-CABLE SCSI attachment design are not affected.
Check the System to determine the cabling method installed according to the following diagrams:

  1.  SINGLE CABLE METHOD (PC Server 720):

     The CD-ROM is attached between the RAID controller or SCSI adapter and the DASD backplane, as follows:

                o---------------------o----o---------o--------o   o
          ______|_____                |    |      ___|___    _|___|_
         |RAID ADAPTER|          Extra "drops"    |CD-ROM|  | DASD |
         |     or     |          (connectors)     |      |  | BACK-|
         |SCSI ADAPTER|          for additional   |      |  | PLANE|
         |____________|          SCSI devices     |______|  |______|
          (Channel A)                             (BAY A1)   (BANK C)
     

     This configuration includes:

  2.  TWO CABLE SOLUTION (PC Server 720):

     The DASD BACKPLANE is attached between the RAID controller or SCSI adapter and the CD-ROM, as follows:

                  Cable:              Cable:
                  P/N 82G3613               P/N06H3751
                    - OR -
                  P/N 06H6876
               o--------o----o    o--------o-------------o----o--o Term.
          _____|______  |   _|____|_    ___|___          |    |
         |SCSI ADAPTER|     |DASD  |    |CD-ROM|     Extra "drops"
         |     or     |     |BACK- |    |      |     (connectors)
         |RAID ADAPTER|     |PLANE |    |      |     for additional
         |____________|     |______|    |______|     8-Bit SCSI devices
          (Channel A )      (Bank C)    (Bay A1)
     

     This configuration requires:

  3.  SINGLE CABLE METHOD (PC Server 320):

     The CD-ROM is attached between the RAID controller or SCSI adapter and the DASD backplane, as follows:

               o---------------o-------------o TOP
         ______|______      ___|___       ___|____
         |RAID ADAPT.|     |CD-ROM |      |DASD  |
         |  or       |     |       |      |BACK- |
         |SCSI CONTR.|     |       |      |PLANE |
         |___________|     |_______|      |______|
                                             |
                                             o
     

     This configuration includes:

  4.  TWO CABLE SOLUTION (PC Server 320):
     The DASD BACKPLANE is attached between the RAID controller or SCSI adapter and the CD-ROM, as follows:

                  Cable:
                  P/N 06H6876
               o------------o--------o TOP
          _____|______      |     ___|____
         |SCSI ADAPTER|           |DASD  |
         |    or      |           |BACK- |
         |RAID ADAPTER|           |PLANE |       Cable:
         |____________|           |______|       P/N 06H3751
                                     |
                                     o------- o----------o----o--o Term.
                                           ___|___       |    |
                                           |CD-ROM|  Extra "drops"
                                           |      |  (connectors)
                                           |      |  for additional
                                           |______|  8-Bit SCSI devices
     

    This configuration includes:


 **************************************************************
 If the Server has the SINGLE SCSI cable, with the CD-ROM
 attached between the SCSI controller (or the RAID adapter) and
 the DASD Backplane, this ECA is applicable (see 1 and 3 above).
 **************************************************************


PREREQUISITES: NONE

COMPANION: NONE

CONCURRENT: NONE

DETAIL:

Early production of the Server 720 and all of the Server 320 Hot-Swap models contained a single multi-drop SCSI cable to connect the 8-bit CDROM drive, SCSI or RAID Adapter, and the Hot-Swap Backplane. Some of these Systems, with 8-bit SCSI devices (CDROM drive) installed between the SCSI Adapter and hot Swap Backplane have experienced intermittent "General Failures" or "Read Errors"(example: CDROM reads) Specifically the 4x CDROM configured in the Server 720.
These failures may occur during applications or diagnostics.
The frequency of failure may change with removal or addition of 16-Bit Hard drives.
While no failures have been observed on 720 Systems with the 2X CDROM drive, the two cable solution should be used to ensure stability. This situation is not a fault of the 4X CDROM drive but specific to placement of a 8 Bit SCSI Device between the 16 Bit SCSI / RAID Adapter and the 16 Bit hard drives on the SCSI Bus of the 320 and 720 Servers.

   Example:
            16-Bit --------- 8-Bit -------- 16-Bit
            RAID or          Drive          Drive(s)
            Non-RAID        (CDROM)        (Hard Drives)
            Adapter


The two cable configuration resolves this problem by locating the 8-Bit SCSI Devices AFTER the 16-Bit SCSI Devices.

   Example:
            16-Bit --------- 16-Bit --------- 8-Bit
            RAID or          Drive(s)         Drive(s)
            Non-RAID        (Hard Drives)    (CDROM, Etc.)
            Adapter


For the 720:
Order one of FRU P/N 06H3751 and either FRU P/N 82G3613 (Array) or P/N 06H6876 (Non-Array) using normal parts ordering procedures.
The RAID Controller or SCSI Adapter to Backplane cable will attach to the Backplane next to the power connector.
Cable FRU P/N 06H3751 (Backplane-CDROM-Terminator Cable) will connect from the second connector (on the opposite side of the Backplane) to the CDROM drive and will contain termination.


For the 320:
Order one of the FRU P/N 06H3751 using normal parts ordering procedures. Disconnect the Original Cable from the CDROM. Cable FRU P/N 06H3751 (Backplane-CDROM-Terminator Cable) will connect from the second connector (bottom connector) of the Hot-Swap Backplane to the CDROM drive and will contain termination.

NOTE: All 8-Bit SCSI devices in including the CDROM must be connected to the second cable in either the 320 or 720 Server.

Cable FRU P/N Reference for 2 cable configurations in the 320 and 720 Servers:

    FRU Number              Description
    -----------             -------------------------------
    82G3613  .............  RAID Controller to Hot-Swap Backplane
                            cable for 720 RAID Array Systems
    06H6876  .............  SCSI Adapter to Hot-Swap Backplane
                            cable for 720 Non-RAID Array Systems
    06H3751  .............  Bottom/end of Hot-Swap Backplane to
                            CDROM Terminator Cable (all 320 / 720)
    06H6876  .............  SCSI Adapter / RAID Controller to
                            Hot-Swap Backplane cable for 320 with
                            Hot-Swap Bay Option (standard)


NOTES: Only the FRU Part numbers listed above (82G3613, 06H6876 and 06H3751 for 720, 06H3751 for 320) are eligible for reimbursement under this ECA.


Use Service Code 33, Other office worked 990, and ECA001 to record parts and labor.


This ECA expires September 3, 2002


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