IBM Support

Recovering the padmin Password in VIOS



This document explains how to reset the padmin password for the VIO server.

Resolving The Problem


How can I reset my padmin password for my VIO server?


The padmin password was lost or forgotten.


The information in this document applies to VIOS Versions 1.3, 1.4, 1.5, and 2.1. If you need additional details about booting your system into maintenance mode and starting a limited function maintenance shell, you should consult the product documentation or contact your AIX Support Center.

Booting PCI-Based Systems into Service Mode

When booting a PowerPC into Service mode, cd0 or rmt0 must be before the hdisk in the bootlist. If not, change the bootlist at boot time. On some models, you can set the machine to use a default bootlist that includes both cd0 and rmt0. If a bootable CD or tape is in the CD-ROM or tape drive, the machine will boot from this device.

For most of the newer PCI-based models, selecting the default bootlist with a bootable tape or CD loaded in the machine causes the system to automatically boot from that device. Generally, the next menu on the screen asks the administrator to define the system console.

For all machines discussed here, if you are using a graphical terminal, you will use a function key such as F5. If you are using an ASCII terminal, use an equivalent number key such as 5. Use the numbers across the top of the keyboard, not the numbers on the numeric keypad. On ASCII terminals, the icons may not be displayed on the screen; the number can be pressed between the second and the third beeps, the second beep being a series of three clicks.

1.With bootable media as the same version and level as the system, boot the system. The bootable media can be any one of the following:

o Bootable VIOS installation CD-ROM
o Bootable VIOS Install Tape

Follow the prompts to the Welcome to Base OS menu.
2.Choose Start Maintenance Mode for System Recovery (Option 3). The next screen displays prompts for the Maintenance Menu. Choose Option 1:

Access a Root Volume Group

The next screen prints a warning message and asks you to select 0 to continue. Select 0: 

0  Continue

The next screen asks you to select the proper volume group. Select the proper VIOS rootvg volume group for the VIOS partition in question.

The console will display information about rootvg and a menu with two options. Choose Option 1:

Access this volume group and start a shell.

If you receive errors from the preceding option, do not continue with the rest of this procedure. First, correct the problem. If you need assistance correcting the problem, contact one of the following:

o Local Branch Office
o Your Point of Sale
o Your AIX Support Center
3.Run the passwd command for the padmin user:

passwd padmin
Changing password for "padmin"
padmin's New password:
Enter the new password again:
4.Issue the reboot command:


Related Information

Recovering the root Password in AIX

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Document Information

Modified date:
19 February 2022