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Service Hints & Tips |
Document ID: COBN-385ECJ |
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PC Server 320/520 - Micro Channel parity memory traps
Applicable to: World-Wide
Abstract
Server 320/520 Micro Channel Parity Memory Traps
Problem
Micro Channel versions of the IBM PC Server 320 or 520 may trap or hang with eight(8) PARITY memory SIMMs installed. These errors occur intermittently under heavy system load and have been seen with NetWare, OS/2, SCO, and Windows NT.
Note: The PC Server 520 Micro Channel systems come standard with EOS (ECC-on-SIMM) memory and are only affected if the EOS memory has been replaced with PARITY memory.
Problem Isolation Aids
All of the following must be true for this tip to apply:
- The system is an 8640-Mxx or 8641-Mxx MicroChannel model with PARITY memory. EOS memory systems are NOT affected.
- The memory high rise card is fully populated with 8MB PARITY SIMMs, with 32MB PARITY SIMMs, or with a combination of both.
- All SIMMs are double-sided with twenty-four(24) DRAM modules.
- Removing a pair of SIMMs fixes the problem.
- The memory high rise card installed is FRU P/N96G1339.
- Diagnostics usually run without error.
Follow this procedure:
1. Verify that the processor speed jumpers, J12 and J43 are set correctly. Refer to the system label for processor speed jumper settings.
2. Verify that the amount of installed memory matches the amount saved in Setup.
3. Remove the memory SIMMs from bank 3 (sockets J7 and J8).
4. Verify the memory configuration in Setup.
5. Boot the operating system and monitor the system for proper operation.
Solution
1. If the operating system is now stable, replace the memory high rise card with FRU P/N96G3692, reinstall the memory, and verify the memory configuration in Setup.
2. If the operating system still traps or hangs, continue with failure isolation.
Note: In Micro Channel systems, memory should be installed starting with bank 0. However, when troubleshooting memory failures, the memory may be installed in any memory bank as long as the memory SIMMs are paired. A defective memory bank (a defective pair of memory sockets) on the high rise card can be isolated by moving a known good pair of memory SIMMs to different memory bank locations. Use this procedure to isolate a memory high rise card failure from a memory SIMM failure.
SAS KEYWORDS :
PSY2 D/T8641 8640 PSY2ERR
SERVER PENTIUM PSY2MEM 320
8641 RISER 520 96G1339
96G3692
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Search Keywords |
Health | |
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Hint Category |
Memory, Retain | |
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Date Created |
21-06-96 | |
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Last Updated |
15-07-98 | |
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Revision Date |
14-07-99 | |
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Brand |
IBM PC Server | |
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Product Family |
PC Server 320, PC Server 520 | |
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Machine Type |
8640, 8641 | |
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Model |
MD0; MD2; MDS; MDV; MX0; MXT; MY0; MYR; MYS; MYT; MZ0; MZ1; MZ2; MZV; MDG; MZ0; MZE; MZL; MZS; MZV | |
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TypeModel |
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Retain Tip (if applicable) |
H015437 | |
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Reverse Doclinks |