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The following table outlines the IPL phases from power-on to the AIX login prompt,
matching the phases to corresponding operator-panel checkpoints for a typical system
boot. Also listed are the approximate boot times for each phase, along with their
dependencies for each phase.
Note: The table below lists the major checkpoints only.
Phase #
Phase 1
Phase 2
Phase 3
Phase 4
138
Service Guide
Checkpoints on
Time in phase
Operator Panel
(minutes)
8xxx => OK
Approx. 1
9xxx => 91FF
3 to 6
Exxx => E105
1 to 3
0xxx => blank
2 to 30+
Major contributors to time in phase
Number of I/O drawers
Number of bootable adapters
Number of SSA drives
Number of SCSI drives
Number of Async sessions
Number of processors
Number of adapters
Amount of memory
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