IBM 9306 Hardware Maintenance Manual page 242

CAUTION:
Important:
To eliminate confusion, identical systems are considered identical only if they:
1. Are the exact machine type and model
2. Have the same BIOS level
3. Have the same adapters/attachments in the same locations
4. Have the same address jumpers/terminators/cabling
5. Have the same software versions and levels
6. Have the same Reference/Diagnostics Diskette (version)
7. Have the same configuration options set in the system
8. Have the same setup for the operation system control files
Comparing the configuration and software set-up between "working and
non-working" systems will often lead to problem resolution.
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Hardware Maintenance Manual: IBM PC Server/Enterprise Racks Types 9306, 9308