Air Cleaner User Manual

Cloning Systems: A System backup created on one machine can be installed on
another machine with a different processor, platform type, or other system devices.
However, the machine being backed up must have installed all of the device
support for the destination platform type, processor type, and other required
devices.
If the platform or kernel type differs between the system being backed up and the
system that is installed from the backup, the boot image on the tape must be
created for use on the destination system. This is accomplished by specifying the
-T “platform” and -k “kernel” options.
The following platform types are currently supported with the -T flag:
chrp Common Hardware Reference Platform
rs6k ″Classic″ RISC System/6000 Uni or Multi-processor (AIX 4.2+)
rs6ksmp Multiprocessor RISC System/6000 (AIX 4.1 only)
rspc PCI-based (PC) RISC System/6000
The following kernel types are supported with the -k flag:
up Uniprocessor (single processor)
mp Multiprocessor
Power System Backup: If the -P flag is specified, a power system backup is created.
The power backup differs from the regular system backup in that all filesystem
data is backed up as raw logical volume data. This can increase the performance of
the backup and restoration of the data considerably but imposes certain limitations
on the system installation and restoration of data from the backup:
v No filesystem attributes or mount point can be changed during a system
installation from this backup.
v The logical volume name, logical volume size, and stripe size attributes of the
logical volumes cannot be changed during a system installation from this
backup.
v Only entire logical volumes or filesystems can be restored from the backup, and
only if the logical volume and filesystem, if applicable, are currently inactive. It
is not possible to restore individual files or directories from the backup.
v The entire filesytem is backed up as raw logical volume data. This might result
in longer backup and restore time for filesystems that were only partially full.
When you create a system backup, sysback performs the following functions:
1. Executes the user-created Pre-backup Script. Appendix D, “Creating Scripts for
Customizing the System Backup and Install Process”, on page D-1 describes
how to create this script. This script can perform any function required by the
user prior to the backup process.
2. If you are backing up to a tape device, the block size of the tape drive is
temporarily changed to 512-byte blocks, if necessary. This ensures that the
installation programs are able to read from the media. The block size is
changed back to its original value before the volume group files are placed on
the media.
3. Generates an LVM information file, using the mkvginfo command, that will
contain the information for all volume groups, logical volumes, and filesystems.
A-92 IBM Tivoli Storage Manager for System Backup and Recovery: Installation and User’s Guide