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12.930 bytes |
Service Hints & Tips |
Document ID: MCGN-3UEKBM |
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This document is provided to IBM and our Business Partners to help sell and/or service IBM products. It is not to be distributed beyond that audience or used for any other purpose. |
PC Server 320 / 720 - ECA001: SCSI cable replacement to support CD-ROM
Applicable to: World-Wide
Note: This ECA expires September 3, 2002.
PURPOSE:
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 an 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 System
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/n06H6661 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/n06H6876), 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)
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/N82G3613 P/N06H3751
- OR -
P/N06H6876
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)
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
- Cable FRU P/N 06H6876 (RAID Array and Non-RAID Array systems with Hot-Swap Bay Option.
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/N06H6876
o------------o--------o TOP
_____*______ * ___*____
*SCSI ADAPTER* *DASD *
* or * *BACK- *
*RAID ADAPTER* *PLANE * Cable:
*____________* *______* P/N06H3751
*
o------- o----------o----o--o Term.
___*___ * *
*CD-ROM* Extra "drops"
* * (connectors)
* * for additional
*______* 8-Bit SCSI devices
- Cable FRU P/N06H6876 (RAID Array and Non-RAID Array Systems with Hot-Swap Bay Option).
- Cable FRU P/N06H3751 (RAID Array and Non-RAID Array Systems with Hot-Swap Bay Option).
*************************************************************************************************************************************************
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 4xCDROM 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 2XCDROM 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
Example:
16-Bit --------- 16-Bit --------- 8-Bit
RAID or Drive(s) Drive(s)
Non-RAID (Hard Drives) (CDROM, Etc.)
Adapter
For the 320:
Order one of the FRU P/N06H3751 using normal parts ordering procedures. Disconnect the Original Cable from the CDROM. Cable FRU P/N06H3751 (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:
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FRU Number Description 06H6876 ............. SCSI Adapter to Hot-Swap Backplane 06H3751 ............. Bottom/end of Hot-Swap Backplane to 06H6876 ............. SCSI Adapter / RAID Controller to |
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.
This ECA is "As Required".
SAS KEYWORDS:
PSY2, ECA001, ECBM, PSY2ECA, SERVER, 720, D/T8642, SCSI-2, ROM, CD, PSY2ERR, ECAVALID, HEALTH, P/N82G3613, P/N06H6876, P/N06H3751, P/N06H6661, P/N06H6675, 320, D/T8640, 8640, 8642, SERVICER ONLY
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Search Keywords |
PSY2, ECA001, ECBM, PSY2ECA, SERVER, 720, D/T8642, SCSI-2, ROM, CD, PSY2ERR, ECAVALID, HEALTH, P/N82G3613, P/N06H6876, P/N06H3751, P/N06H6661, P/N06H6675, 320, D/T8640, 8640, 8642, SERVICER ONLY | |
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Hint Category |
CD-ROM Drives, ECA, Retain | |
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Date Created |
12-05-98 | |
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Last Updated |
01-12-98 | |
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Revision Date |
01-12-99 | |
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Brand |
IBM PC Server | |
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Product Family |
PC Server 320, PC Server 720 | |
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Machine Type |
8640, 8642 | |
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Model |
Various | |
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TypeModel |
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Retain Tip (if applicable) |
ECA001, Retain tip H132199 | |
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Reverse Doclinks |
USA=A, EMA=A, AFE=A, Date last altered: A98/05/11, Owning B.U.: USA |