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2.980 bytes |
Service Hints & Tips |
Document ID: DDSE-3UPKDR |
PS/2 Server 95 - RAID options jumpered incorrectly
Applicable to: World-Wide
Service Information
Some fixed disk options for the 9595 RAID system, were shipped with the SCSI bus termination, address, and auto-start jumpers still installed on the drive. When added to a system, the option should not have these jumpers installed (enabled).
The excess terminators will cause signal degradation and may result in highly intermittent and difficult to diagnose system configuration errors or operating system failures.
The 9595A RAID ARRAY system is manufactured with a 3 fixed disk configuration. A total of 4 additional fixed disk options may be installed. No address or termination jumpers should be installed on any of the additional option fixed disks. These options will be automatically addressed and correctly terminated by the "hot plug rack" which is part of the basic 9595A RAID ARRAY system.
The auto-start jumper should not be installed because it allows the drive motor to spin-up immediately with system power-on. The jumper allows a choice of either the motor starting immediately with system power-on, or to be sequence started one at a time by POST. The total starting surge current of all the fixed disks starting simultaneously may cause the system power supply to "self-protect"* by shutting down.
Note: The 9595A power supply, and other PS/2 system power supplies are designed to "self-protect" if current surges beyond certain limits are exceeded. As options are added, the power supply may be unable to provide sufficient starting surge current for all drives during initial power-on. In this case, the power supply "self-protect" will activate, resulting in the system shut down. This may be corrected by removing the Auto-Start jumper from all the option drives. The "self- protect" action by the power supply will not cause damage.
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Hint Category |
Hard Drives, Retain | |
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Date Created |
16-04-94 | |
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Last Updated |
11-01-99 | |
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Revision Date |
11-01-2000 | |
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Brand |
IBM PC Server | |
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Product Family |
Server 95 | |
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Machine Type |
9595 | |
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Model |
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TypeModel |
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Retain Tip (if applicable) |
H123382 | |
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