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 following table lists the major checkpoints only.
Phase # Checkpoints on
Operator Panel
Time in phase
(minutes)
Major contributors to time in phase
Phase 1 8xxx => OK Approx. 1
Phase 2 9xxx => 91FF 3 to 6 Number of I/O drawers
Phase 3 Exxx => E105 1 to 3 Number of bootable adapters
Phase 4 0xxx => blank 2 to 30+ Number of SSA drives
Number of SCSI drives
Number of Async sessions
Number of processors
Number of adapters
Amount of memory
136 Service Guide
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