Air Cleaner User Manual

ManualsBrandsIBM ManualsAir CleanerIBM Tivoli Storage Manager Version5Release6

111

112

113

114

115

116

117

118

119

120

Chapter 10. Recreating or Restoring from Backups

There are many reasons to restore data from a backup. The data might have been

corrupted due to improper user input or application errors, or the data might be

inaccessible due to various hardware problems.

If data was inadvertently deleted or corrupted by a user or application, you will

probably need to restore the data from the backup. If a hardware failure occurred,

you need to perform additional steps before you can restore the data. For instance,

if a disk failure occurs that makes a volume group inaccessible, it will probably be

necessary to delete and recreate the volume group, recreate the filesystems and

logical volumes, and mount the filesystems, before the data can be restored. Any

SysBack backup type can be used in this process, but the backup must contain the

desired data, as well as the desired system information, to recreate or restore the

desired data.

Note: This section does not describe the process for reinstalling the system, only

recreating and restoring data onto an already active system. For information

on reinstalling the system from a system backup, refer to Chapter 12,

“System Installation and Maintenance”, on page 12-1.

Removing Volume Groups, Logical Volumes, and Filesystems

Before any volume group, logical volume, or filesystem can be recreated on an

active system, you must remove the old volume group, logical volume, or

filesystem. This process is not detailed within this manual because the steps vary

too widely depending on the reason for the recreation process. For detailed

assistance on any of these activities, contact your preferred AIX Technical Support

Organization. The following guidelines might help in deleting the old system

information:

v Volume Group: To delete a volume group, first refer to the information below

on how to make filesystems and logical volumes inactive. Then, use the AIX

varyoffvg command to make the volume group inactive and the exportvg

command to remove the volume group information from the system

configuration database.

v Filesystems: To delete a filesystem, the filesystem must be unmounted, even if

the filesystem is currently inaccessible. You can do this with the AIX umount

command. To use this command, no user can currently be changed to (cd

command) any directory within the filesystem, and no process on the system can

have any file in the filesystem open.

If you are removing the volume group containing this filesystem, the filesystem

will be removed when the volume group is exported. However, to remove only

a select filesystem, first unmount the filesystem, then use the AIX rmfs

command to remove it.

v Logical Volumes: To delete a logical volume, no process can have the logical

volume open. Certain logical volumes used by the system are normally open by

system processes, and the steps to make them inactive vary depending on the

logical volume type. To list the logical volumes for a volume group, use the

lsvg -l VGname

command. This command also shows the logical volume type and whether the

logical volume is currently opened (active).