Select DST console mode

This option causes the operating system to share the console workstation with DST during an IPL of the operating system.

Notes:

For the i5/OS® operating system, this option requires the Install privilege. For more information on authority, see Work with service tools user IDs.
When your system is in the full or limited paging environment, the appearance of the Select DST console mode option varies depending on the operating system. For more information, see For more information, see System paging environments and i5/OS operating system.

Operating system displays remain, until either of the following occurs:

You enter Function 21 (start DST) from the control panel.
You make a system request by pressing the System Request key while holding down the Shift key, then typing DST and pressing the Enter key.
The program debug service function encounters a breakpoint.

Selecting the Select DST console mode option while you are in the full paging environment causes the operating system display to be restored. Any active service functions remain active, and any device that was allocated to the service tool remains allocated.

Options on the DST Console Mode display

The DST Console Mode display includes options to exit DST and to start DST in debug mode.

Exit Dedicated Service Tools (DST) on IPL: Service functions will not interrupt the console display unless you have already set debug mode. Sign-on is necessary to access DST. All active service functions end.

Start DST in debug mode on IPL: Service functions can interrupt the normal operating system process to display debug information. When an operating display appears, you can enter DST by performing the System Request Key procedure. This allows the Use Dedicated Service Tools (DST) display to appear without requiring you to sign on to DST. For more information on the System Request Key procedure, see Using the System Request Key.