Accessing dedicated service tools

This information covers how to start dedicated service tools (DST).

You can start DST in the following ways:

Performing an IPL to DST (see Performing an IPL to dedicated service tools).
Pressing the System Request key while the system is operational.
Selecting function 21 while the system is operational (see Selecting function 21 from the control panel).
This is available from the primary partition only.
Performing an alternate IPL to DST (type D IPL) (see Performing an alternate IPL to DST (type D IPL)).
After performing a type D IPL on a primary partition, the first step in DST must be configuration recovery.
Pressing F16, which is not displayed, while in DST debug mode during a step-mode IPL.