To Install BOS from a System Backup

AIX Version 4.3 Installation Guide

To Install BOS from a System Backup

This section details the procedure for installing BOS from a system backup.

Prerequisites

The following conditions should be met before beginning the procedure:

All hardware must already be installed, including external devices, such as tape and CD-ROM drives.
Obtain the system key for the lock (if present) on your system unit.

Obtain your system backup image:

Tape	BOS tapes, created in one of the following ways: Using the Web-based System Manager Backups application Using the SMIT Backup the System menu From the command line, using the mksysb -i Target command.
Network	The path to your backup image file. Refer to AIX Version 4.3 Network Installation Management Guide and Reference for information about installing a backup across a network.

To Start the System

Note: Before you begin, select the tape drive as the primary boot device. For additional information, refer to the System Management Services section in your hardware documentation.

Use this procedure to start your machine:

Skip to step 2 if you have a new system or your system is turned off. If the system is already turned on, do the following to put the backup tape in the tape drive and then shut down the system:
1. Log in as root user.
2. Put the backup tape in the drive.
3. Enter the following command:
```
shutdown -F
```
  The Halt completed ... message appears when the shutdown process completes.
  Note: On some models, the shutdown command turns off the power to the system unit. It does not, however, automatically turn the power switch to the Off position.
4. Power off the system unit when the shutdown process completes.
Turn the system key (if present) to the Service position.
Turn on all attached external devices, such as terminals, CD-ROM drives, tape drives, monitors, and external disk drives. Do not turn the system unit on until step 4. Turning on the external devices first is necessary so that the system unit can identify them during the startup (boot) process.
If you have not already put the backup tape in the drive, do so now.
Notes:
1. You may find that on specific hardware the tape drive door will not open while the system unit is turned off. If you have trouble opening the tape drive door during installation, use the following procedure:
  1. Turn the system unit on.
  2. Put the tape in the drive.
  3. Turn the system unit off and wait 30 seconds.
2. On some models that have a door to the tape drive, there may be a waiting period of up to three minutes before the tape drive door opens after you have pressed the button to open the tape drive. Some models also require that the button for the tape drive door be held in the pressed position for a few seconds before the tape drive door will open.
If you are not using an ASCII terminal, skip to step 6. If you are using an ASCII terminal, set the communications options as follows:
- Line Speed (baud rate) = 9600
- Word Length (bits per character) = 8
- Parity = no (none)
- Number of Stop Bits = 1
- Interface = RS-232C (or RS-422A)
- Line Control = IPRTS
Set the keyboard and display options as follows:
- Screen = normal
- Row and Column = 24x80
- Scroll = jump
- Auto LF (line feed) = off
- Line Wrap = on
- Forcing Insert = line (or both)
- Tab = field
- Operating Mode = echo
- Turnaround Character = CR
- Enter = return
- Return = new line
- New Line = CR
- Send = page
- Insert Character = space
  Note: If your terminal is an IBM 3151, 3161, or 3164, press the Ctrl+Setup keys to display the Setup Menu and follow the on-screen instructions to set these options. If you are using some other ASCII terminal, refer to the appropriate documents for information about how to set these options. Some terminals have different option names and settings than those listed here.
Power on the system unit. The system begins booting from the backup tape, which might move back and forth, or the CD-ROM.
Note: You can boot from production media (tape or CD-ROM) if your backup tape fails to boot. The initial Welcome screen includes an option to enter a maintenance mode in which you can continue the installation from your backup tape. Refer to "Troubleshooting an Installation from a System Backup" for more information.

After several minutes, c31 is displayed in the LED.
Choose the system console, if necessary.
If you have more than one console on your machine, each terminal and direct-attached display device may present a screen that instructs you to press a key to identify your system console. If these screens appear, press the specified key on the device you choose for your system console. (The system console is the keyboard and display device used for installation and system administration.) Press a key on only one console.

However, if the bosinst.data file lists a valid display device for the CONSOLE variable, you do not manually choose a system console. Read "Customizing the BOS Install Program" for more information about the bosinst.data file.
The type of screen that appears next depends on whether you are attempting a prompted or nonprompted installation. Go to one of the following sections:

"Nonprompted Installation" if the backup image is configured to install automatically, without having to respond to the installation program.
OR
"Prompted Installation" if you need to use menu prompts to install the backup image. Use these instructions also if a nonprompted installation halts and the Welcome to Base Operating System Installation and Maintenance screen appears.

Nonprompted Installation

A successful nonprompted installation requires no further instructions because the installation is automatic. The sequence of events follows:

The first BOS installation screen appears on the monitor. This screen is untitled and blank, except for a zero digit in the bottom left corner.
The screen pauses for five to 10 seconds before the next screen appears. If you wish, you can use the short pause to interrupt the automatic installation and start a prompted session. Do this by typing three 000 (zeros) at the terminal. The installation will continue in a prompted mode.

Note: The nonprompted installation stops and prints the Welcome to Base Operating System Installation and Maintenance screen if the backup image holds configuration information incompatible with the machine you are installing. For example, if the image specifies a target disk that does not match what is in the machine, BOS installation starts a prompted session in which you can modify the installation.
The Installing Base Operating System screen appears next.
This second screen signals the start of the BOS installation, reporting the rate of completion and duration.

The Please turn the system key to the NORMAL Position message appears on this screen if the key is not already in the Normal position. You can turn the key at any time while the screen is showing. The installation continues regardless of the key position.
The system reboots when the installation completes.
The reboot is automatic if the system key (if present) is in the Normal position. Otherwise, another screen directs you, at the end of the installation, to turn the key to Normal and press Enter. The system reboots, in this case, when you press the Enter key.

Prompted Installation

The Welcome to the Base Operating System Installation and Maintenance screen is the first screen to appear for prompted installations. This and subsequent BOS installation screens provide help text, which you can view by entering 88 .

Choose the Change/Show Installation Settings and Install option.
The System Backup Installation and Settings screen appears.

This screen shows current settings for the system. An ellipsis follows the disk listed in the first line if there is more than one disk selected.
Either accept the settings or change them. For more information on using map files, see "Backing Up Your System".
To accept the settings and begin the installation, skip to step 8.

To change the settings, continue with step 3.
Enter 1 in the System Backup Installation and Settings screen to specify disks where you want to install the backup image. The Change Disk(s) Where You Want to Install screen appears.
This screen lists all available disks on which you can install the system backup image. The >>> ( three greater-than signs) mark each selected disk.
Type the number and press Enter, for each disk you choose. Type the number of a selected disk to deselect it. You can select more than one disk.
You can also specify a supplemental disk by entering 66 (type 66 and press the Enter key) for the Disks not known to Base Operating System Installation option. This option opens a new menu that prompts for a device support diskette for the supplemental disk. BOS installation configures the system for the disk and then returns to the Change Disk(s) Where You Want to Install screen.
Press the Enter key when you finish selecting disks.
The screen that appears next depends on whether all the selected disks have map files available:
- If one or more selected disks have no maps, BOS installation returns directly to the System Backup Installation and Settings screen. Skip to step 7.
- If all selected disks have maps, the Change Use Maps Status screen appears, where you choose either to use or not use the maps for installation. Continue with step 6.
To preserve the placement of files during a future restoration of the backup, you can create map files before backing up a system. Map files, stored in the /tmp/vgdata/rootvg directory, match the physical partitions on a drive to its logical partitions. Create map files either with the SMIT Backup the System menu or the mkszfile command, or specify the -m option when you run the mksysb command.
For more information about map files, see "Using Map Files for Precise Allocation" in AIX Version 4.3 System Management Guide: Operating System and Devices.
Enter either 1 or 2 in the Change Use Maps Status screen to specify whether the installation program is to use maps.
When you complete this choice, BOS installation returns to the System Backup Installation and Settings screen.
Decide whether BOS installation is to shrink file systems on the disks where you install the system. When you choose this option, the logical volumes and file systems within a volume group are recreated to the minimum size required to contain the data. This reduces wasted free space in a file system.
File systems on your backup image might be larger than required for the installed files. Press the 2 key to toggle the Shrink File Systems option between Yes and No in the System Backup Installation and Settings screen. The default setting is No.

Note: Shrinking the file system will disable the use of maps.
Enter 0 to accept the settings in the System Backup Installation and Settings screen.
The Installing Base Operating System screen appears, reporting the rate of completion and duration. Step 2 under "Nonprompted Installation" shows an example depiction of this screen.

The Please turn the system key to the NORMAL Position message appears on this screen if the key is not already in the Normal position. You can turn the key at any time while the screen is showing. The installation continues regardless of the key position.

An untitled screen temporarily replaces the Installing Base Operating System screen if you specified a supplemental disk in step 4 . This screen pops up about halfway through the installation, instructing you to again put the device-support diskette in the drive and press the Enter key. BOS installation reconfigures the supplemental disk, then returns to the Installing Base Operating System screen, which continues to report the progress of the installation.

The system reboots automatically when the installation completes.

The reboot is automatic if the system key (if present) is in the Normal position. Otherwise, a new screen directs you, at the end of the installation, to turn the key to Normal and press Enter. The system reboots, in this case, when you press the Enter key.

Where Do I Go Next?

In new installations on graphical systems, a post-installation program, Configuration Assistant, starts automatically when BOS installation reboots the system. For ASCII systems, the post-installation configuration program is Installation Assistant. Whether this configuration program starts following your backup installation depends on settings in your backup image:

If the bosinst.data file in your backup image specifies a customization script, Configuration Assistant (or Installation Assistant for ASCII) does not start. The script, which takes the place of Configuration Assistant or Installation Assistant, configures your system before the BOS installation program reboots.
If the system on which your backup image was made has not been configured with Configuration Assistant (or Installation Assistant for ASCII), Configuration Assistant (or Installation Assistant for ASCII) starts immediately following the BOS installation reboot.
If the system on which your backup image was made has already been configured with Configuration Assistant (or Installation Assistant for ASCII), the system prompt appears immediately following the BOS installation reboot. Configuration Assistant (or Installation Assistant for ASCII) does not start.

Go to "Customizing Your Installation" to configure the installed machine with optional software, network communications, user accounts, and other settings.

If the Configuration Assistant (or Installation Assistant for ASCII) does not start automatically, and you do not want to configure the machine, the installation from backup is complete.