Air Cleaner User Manual

Chapter 12. System Installation and Maintenance
A backup created using the System Backup option can be used to completely
reinstall the original system from which it was made or to install other machines
with the same or different hardware configurations. During the installation process,
the following functions are provided:
v The volume group, physical volumes, and logical volumes contained on the
backup are compared with the current system hardware configuration. If there
are inconsistencies, such as missing disks or smaller disks that cannot contain
the prior data, you must change the volume group or logical volume
information to fit the new system configuration.
v A simple menu interface is provided to change any volume group, logical
volume or filesystem size or other attribute. This includes selecting the disks
contained in each volume group or the disks where each logical volume will
reside. You can also exclude certain volume groups, logical volumes, or
filesystems from the installation or move logical volumes and filesystems
between volume groups.
v Optionally, individual volume groups, other than rootvg, can be imported from
disk (if they currently exist), ignored, or recreated and restored. By default, they
are created on the original disks (according to the hardware addresses, if they
exist).
v By default, all logical volumes are recreated at their original sizes and on the
same disks and disk locations, if available. If original disk locations are not
available, the logical volumes are recreated where space permits.
v Logical volumes are, by default, recreated using physical partitions that are
contiguous on the disks, unless you specify that the physical partition maps to
be preserved when the backup was created. You can also select to change the
partition policy for select logical volumes during the installation process.
Allowing the partitions to be created contiguously reduces any prior
fragmentation that might have existed, thereby increasing the I/O performance
to those logical volumes.
v The original device configuration is restored if the same adapters are detected on
the new system.
Recovery Installation
One of the options provided on the Utilities menu in the installation menus is to
perform a recovery installation. This option enables you to reinstall the operating
system from a system backup without affecting other filesystems and logical
volumes in the rootvg volume group. This option is not intended for upgrading
the operating system level, but recovering from operating system failures. Refer to
“Performing Recovery Installation” on page 12-13 for added details.
No-prompt Installation
Installation processes for a client may be configured for a promptless installation.
Refer to the Set Network Install Client Defaults option in Chapter 13, “Network
Boot/Installation Configuration”, on page 13-1 for details on this configuration.
If the client is configured for a no-prompt installation, the SysBack Installation
and Maintenance menu does not appear as described in the following section, but
© Copyright IBM Corp. 2002,2003 12-1