MPE/iX System Utilities Reference Manual (32650-90908)

Chapter 6
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6 DISCUTIL
DISCUTIL is a standalone utility that lets you perform various disk operations without the operating system.
It is particularly important when you need to move files to tape from disks on a system that is logically
inoperable, such as one with directory damage. (Once you have done so, you then use the RECOVER option of
the VOLUTIL utility on this tape to move the files back onto disk.)
You start the utility by entering DISCUTIL at the Initial System Load (ISL) prompt from the system console.
(You may not use DISCUTIL at another terminal.) Once DISCUTIL is loaded and running, the operating system
is not available.
Operation
You may invoke DISCUTIL only from the ISL> prompt. To display the ISL> prompt and start the utility,
perform these steps:
1. Initiate a soft reset of the system by entering
CTRL B.
2. At the CM> prompt, enter the following command to start the autoboot process:
RS
ENTER
3. When you see the message TO OVERRIDE, PRESS ANY KEY WITHIN 10 SECONDS, press RTN immediately.
4. When you see the message Interact with IPL (Y or N)?, enter Y. The system displays the ISL>
prompt.
5. To start DISCUTIL, enter:
ISL> DISCUTIL
The DISCUTIL banner will appear followed by the discutil> prompt.
NOTE To see other utilities available before the system is started enter LS at the ISL> prompt.
DISCUTIL Commands
At the discutil> prompt, you may enter any of the following commands:
CONFIGURE Configures additional devices. (The system console, all disks that were mounted
at the time of the failure, and the tape drive are configured by default.)
DISMOUNT Dismounts a disk volume making it inaccessible to DISCUTIL.
DO Reexecutes a command in the command history stack.
DSTAT Displays information about each mounted volume.
EXIT Terminates DISCUTIL and reboots the system.
HELP Lists available commands.
LISTREDO Displays the command history stack.