Air Cleaner User Manual

If there are no inconsistencies with the new system, you are asked:
Are you sure you wish to create the volume group(s) (y/n)?
or
Are you sure you wish to create the logical volume(s) (y/n)?
Answering “y” to this question recreates the volume groups or logical volumes as
specified. When the process has completed, you are asked to press Enter to return
to the SMIT screen.
Understanding Incremental Restores
If you created incremental backups, then you must understand the process of
restoring data from these backups. Examples of planning and performing
incremental backups and their corresponding restoration processes are detailed in
“Understanding Incremental Backups” on page 4-1.
An incremental restore requires restoring a volume group or filesystem to the state
of its last full (level 0) backup, and then reapplying each subsequent incremental
backup level until the volume group or filesystem is returned to its current state.
Because only a level 0 backup contains all of the data in either the volume group or
filesystem, this backup must be restored before any additional incremental levels
can be applied.
Restoring an incremental backup does not only add or change files in a filesystem,
but can also remove files from a filesystem. If a file was removed from the
filesystem between the time a level 0 and a level 1 backup was created, the file can
be restored during a level 0 restore, and removed from the system again during a
level 1 restore.
SysBack does not check the order in which the incremental levels are restored. The
user must ensure that the incremental backups are restored in the proper order.
SysBack requires that the user explicitly indicate that they want to restore an
incremental backup. If an attempt is made to restore a volume group or filesystem
from an incremental backup without the user indicating this intent, the restore
process does not proceed.
Restoring level 0: When a level 0 backup is restored, the filesystems on the system
that are to be restored are first cleared of all files. Then, the backup of the
filesystems is restored. At this point, the filesystems have been returned to the
exact state at which the level 0 backup was made.
Restoring other levels: After the level 0 backup is applied, the subsequent backup
level or levels must be applied to return the filesystems to their most recent state.
The number of levels to restore differs depending on the design of the incremental
backups. The important thing to remember is that the most recent of each
subsequent level must be applied in the correct order. If, for instance, you
performed multiple level 3 backups, it is only the most recent level 3 that needs to
be restored, because the most recent level 3 backup supersedes all other level 3
backups.
Chapter 10. Recreating or Restoring from Backups 10-7