Backup and Restore 2 Manual

Backup and Restore 2 Overview
Backup and Restore 2 Manual—522696-019
1-5
Open System Services (OSS)
OSS files less than and greater than 2 GB that you need to restore to a fileset that
does not support files greater than 2 GB, Backup and Restore 2 restores the files less
than 2 GB but skips the files greater than 2 GB.
OSS Objects
BRCOM supports these OSS objects:

Directories

Links: hard links and symbolic links

Named pipes

Ordinary files

Restricted-Access filesets

Unrestricted filesets
You can directly specify directories, subdirectories, and ordinary file objects in
BACKUP or RESTORE commands. For each of these objects, all its subordinate
objects are automatically backed up or restored. However, you can exclude some
subordinate objects using the job options or a WHERE expression.
Directories
The OSS file system allows a high degree of nesting; you can have a hierarchy of
several levels of subdirectories. A subdirectory is any directory that belongs to another
directory. However, that subdirectory is also a directory to its subdirectories.

Backing up a directory includes backing up all the subdirectories and files
subordinate to the directory. Device special files or sockets are not backed up.

Restoring a directory includes restoring all its subordinate subdirectories and files.
If you restore a directory that already exists, the directory is left as it is, and the objects
in the directory are restored. After the restore operation, the directory contains both the
objects that were restored and any other objects that were present before restoring the
data.
Links: Hard Links and Symbolic Links
Specifying a symbolic link causes the link to be backed up as a link. Only the link is
backed up; no additional data is backed up.
Specifying a hard link causes the link and the data in the linked file to be backed up.
However, no data is backed up more than once. For example, if a file and a hard link to
that file are both backed up, the data in the file is backed up only once. For example,
suppose mylink is a hard link to myfile. Specifying either mylink, myfile, or both causes
the data in the file to be backed up exactly once.