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Document ID: MCGN-3V6QU7 |
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PCServer720 - 4X SCSI CD-ROM read errors
Applicable to: World-Wide
SYMPTOM:
Read errors or a general CD-ROM drive failure may occur in PC SERVER 720 (M/T8642) if a 4X CD-ROM drive is attached between the SCSI adapter and hard disk drive (HDD) backplane with cable FRU P/N 06H6661 for array systems or FRU P/N 06H6675 for non-array systems.
Note: Refer to 8642 ECA001 (RETAIN Record # H132199) for additional information.
PROBLEM ISOLATION AIDS:
Early levels of the Server 720 contained a single multi-drop SCSI cable (FRU P/N 06H6661 for Array systems or FRU P/N 06H6675 for Non-Array Systems) which attaches to the CD-ROM in Bay "A" as well as the "front connector" of the HDD Backplane in Bay "C." The position of the CD-ROM drive on the SCSI cable places it between the HDD backplane and the SCSI adapter.
CD-ROM diagnostics may indicate a general failure or read errors. The frequency of failure may change with the removal
or addition of hardfiles.
2X SCSI CD-ROM drives are not affected. The speed of the CD-ROM can be determined by its width. The 4X CD-ROM device is 1 5/8" wide whereas the 2X CD-ROM Device is 1" wide.
FIX:
PC Server 720 systems exhibiting CD-ROM failures with the single multi-drop cable installed, should have that cable replaced by FRU P/N06H3751 AND either P/N06H6876 (Non-Array) OR P/N82G3613 (Array).
The original single multi-drop cable in the 8642 PC Server 720 is routed from the SCSI Hard Disk Controller to the CD-ROM and then to the "front" connector of the backplane.
A new two cable design improvement has been developed to attach the CD-ROM directly to the HDD backplane and provide an additional 68 pin connector to attach an option in the second upper bay.
Cable FRU P/N82G3613 (Array) OR FRU P/N06H6876 (Non-Array) will connect from the SCSI Hard Disk controller directly to
the "front" connector of the backplane.
Cable FRU P/N06H3751 (Backplane-CD-ROM-Terminator Cable) will connect from the second "rear" or "bottom" connector on the backplane to the CD-ROM drive and will contain termination. If the failure persists, continue with normal problem isolation procedures.
SAS KEYWORDS:
PSY2, PSY2CDROM, 8642, IBMPC, PSY2ERR, PSY2PART, SERVER, RAID, 720, CD, ROM, 4X, ECA001, ECA, 001, H132071
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Search Keywords |
PSY2, PSY2CDROM, 8642, IBMPC, PSY2ERR, PSY2PART, SERVER, RAID, 720, CD, ROM, 4X, ECA001, ECA, 001, H132071 | |
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Hint Category |
Retain | |
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Date Created |
05-06-98 | |
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Last Updated |
12-06-98 | |
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Revision Date |
09-06-99 | |
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Brand |
IBM PC Server | |
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Product Family |
PC Server 720 | |
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Machine Type |
8642 | |
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Model |
Various | |
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TypeModel |
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Retain Tip (if applicable) |
H132071 | |
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Reverse Doclinks |
Date last altered: A96/01/16, Owning B.U.: USA, USA=A, EMA=A, AFE=A |