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4.702 bytes |
Service Hints & Tips |
Document ID: GSMH-3EXEMM |
PC Server 325 - SCSI drives
Applicable to: World-Wide
SCSI Drives:
The server supports Small Computer System Interface (SCSI) drives. You can attach multiple SCSI drives to the two Ultra SCSI connectors on the system board, which share the same Ultra SCSI bus. The SCSI controller on the system board can support up to 6 internal SCSI devices and 1 external SCSI device.
If you install additional SCSI devices, you must set a unique identification (ID) for each SCSI device that you connect to the Ultra SCSI connector, so that the Ultra SCSI adapter can identify the devices and ensure that different devices do not attempt to transfer data at the same time.
Note:
Any information about SCSI drives also applies to other SCSI devices, such as scanners and backup tape drives.
Setting SCSI IDs:
The PC Server 325 Type 8639 supports SCSI IDs 0 to 15. ID 7 is reserved for the Ultra SCSI controller. The scanning sequence for preinstalled SCSI devices proceeds from the lowest SCSI ID to the highest, starting with 0. For 16-bit devices, set the IDs to any unused number between 8 and 15. For 8-bit devices, set the IDs to any unused number between 0 and 6.
The preinstalled SCSI CD-ROM drive is shipped with the SCSI ID set to 3. If the server is shipped with a SCSI hard disk, it's SCSI ID will be set to 6.
Refer to the instructions supplied with the SCSI devices for information about setting a SCSI ID.
Termination Requirements:
Both ends of the SCSI cable must be terminated. Install SCSI devices starting at the ends of the internal and external SCSI cables. The SCSI device, at the end of the SCSI cable, should be terminated, otherwise a special connector, called a terminator, must be used to terminate the end of the SCSI cable.
If you have only internal SCSI devices connected to the internal SCSI connector and the bulkhead cable has not been installed, the SCSI controller becomes the termination for the external SCSI connector.
If internal SCSI devices are attached to the SCSI controller, the last internal device on the bus (cable) must be terminated, and the termination must be disabled on the other devices connected to the SCSI connector. The SCSI bus on the system board is already terminated. If you use the internal SCSI connector and the external SCSI connector on the system board, both internal and external ends of the cable must be terminated.
Refer to the instructions that come with the SCSI device for more information about termination.
Refer to the instructions that come with the SCSI devices for information about setting a SCSI ID.
System board jumper J29 must also be jumpered as follows:
- If an 8-bit device is connected to the external SCSI cable, J29 pins 1-2 must be jumpered.
- For any other combination of SCSI devices attached to the SCSI external or internal cables, J29 pins 2-3 can be jumpered. See "System Board" and "System Board Jumpers".
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Hint Category |
Hard Drives, Hardware Maintenance Information, SCSI | |
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Date Created |
07-03-97 | |
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Last Updated |
22-01-99 | |
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Revision Date |
03-08-99 | |
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Brand |
IBM PC Server | |
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Product Family |
PC Server 325 | |
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Machine Type |
8639 | |
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Model |
EJ0; ES0; ESV; RD0; RF0; RS0; XD0; XDV; XF0; XFV; XJ0; XS0; XSV; YS0 | |
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