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Values for IPL types, system operating modes, and speeds

Learn about the valid initial program load (IPL) types, system operating modes, IPL speeds, and firmware IPL types that are used in control panel functions.

The following table shows examples of the IPL types and descriptions.

Note: Operating system IPL types are displayed only when the operating system IPL mode has been enabled from the operating system.

Table 1. Operating system IPL types
Initial program load (IPL) type	Action or description
A	IPL from disk using copy A of the system Licensed Internal Code.
B	IPL from disk using copy B of the system Licensed Internal Code.
C	Reserved for hardware service use only. Attention: Incorrect use of this function can cause severe data loss.
D	IPL from media other than load-source disk. Alternate IPL for code installation support.

The following table shows examples of the operating mode values.

Table 2. System operating mode values
System operating mode	Action or description
Manual (M)	Allows you to perform an attended IPL and provides access to restricted control panel functions.
Normal (N)	Allows you to perform an unattended IPL.

The following table shows examples of the IPL speeds.

Table 3. IPL speeds
IPL speed	Action or description	Details
F	Fast override for one IPL.	Fast IPL runs. Some hardware diagnostics are passed over.
S	Slow override for one IPL.	Full hardware diagnostics runs. Use this speed whenever hardware is changed, for intermittent hardware failure, or on the first installation IPL. The following diagnostics are run: Main storage tests. Service processor inter-chip interface tests (wire test). Extended logical built-in self tests.
V=F	Use system-defined speed.	Fast IPL set by the system value (displayed at function 01).
V=S	Use system-defined speed.	Slow IPL set by the system value (displayed at function 01).
V	Fast IPL or slow IPL set by the system value (selected at function 02).	Function 02 selection, or the system default at each IPL.
H	Hyperboot override for one IPL.	Hyperboot IPL runs. Most hardware diagnostics are skipped and the system's cached data is used unless new VPD is discovered.
V=H	Use system-defined speed.	Hyperboot IPL is set by the system value (displayed at function 01).

The following table shows examples of firmware IPL types.

Table 4. Firmware IPL types
IPL type	Action or description
P	IPL from disk using copy P of the system Licensed Internal Code.
T	IPL from disk using copy T of the system Licensed Internal Code.

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Last updated: Thu, October 10, 2013