IBM 6C4 - Manual (Page 57)

The scan log dump content can be set to the following:
1 = As Requested
The processor run-time diagnostics will select the contents of the dump file
based on the type of error that occurs. This is the default.
2 = Optimum
The dump will include the smallest amount of information to diagnose a
hardware error.
3 = Complete
The dump will include as much information as possible to allow the complete
analysis of hardware and software errors.
4 = Minimum
The dump will include the smallest amount of information possible (a minimum
number of hardware scan log rings).
The complete dump will take the longest time to finish; it may take as long as 1.5 hours
on a fully configured system.
Option 3, Immediate Dump, can only be used when the system is in the standby state
with power on. It is used to dump the system data after a checkstop or machine check
occurs when the system firmware is running, or when the operating system is booting
or running.
The scan log dump content can also be set from the Tasks menu in the AIX diagnostic
service aids.
If a valid dump file already exists, the dump control code will stop because the contents
of the prior dump must be protected.
Chapter 3. Using the Service Processor 39