Values for IPL types, system operating modes, and speeds

Reference tables for IPL types, system operating modes, and speeds.

Table 1, Table 2, Table 3, and Table 4 describe the valid IPL types, system operating modes, speeds, and firmware IPL modes that are used in control panel functions 01 and 02. Table 5 describes whether the Hardware Management Console (HMC) is active for HMC managed systems.

Notes:

Systems managed by the HMC should use the HMC to perform control panel functions. For information on performing control panel functions using the HMC, see Control panel functions.
OS IPL types are displayed only when the OS IPL mode has been enabled from the operating system.

Table 1. OS IPL types
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 under the direction of Rochester development support. Attention: Severe data loss can occur with improper use of this function.
D	IPL from media other than load-source disk. Alternate IPL for code installation support.

Table 2. System operating mode values
System operating mode	Action or description
Manual (M)	Allows you to access DST and perform an attended IPL.
Normal (N)	Allows you to access the operating system and perform an unattended IPL.

Table 3. IPL speeds
IPL speed	Action or description	Details
F	Fast override for one IPL.	Fast IPL run. Some hardware diagnostics are skipped.
S	Slow override for one IPL.	Full hardware diagnostics run. Use whenever hardware is changed, for intermittent hardware failure, and on the first installation IPL. The following diagnostics are run: Main storage tests. CEC Inter-chip interface tests (wire test). Extended Logical Built-in Self Tests.
V=F	Use system-defined speed.	Fast IPL set by system value (displayed at function 01).
V=S	Use system-defined speed.	Slow IPL set by 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.

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.

Table 5. HMC indicators
HMC indicator	Action or description
HMC=1	The HMC is connected.
HMC=0	The HMC is disconnected.