Installation guide

The dump(8) reference page describes the command options that you use to
specify the characteristics of the tape device, such as block size, tape
storage density, and tape length. The following list describes the most
commonly used options to the dump command:
−
integer
Specifies the dump level as an integer (0-9). A
dump level of 0 causes a full dump of the specified
file system. All other dump levels cause an
incremental backup. That is, only files that have
changed since the last dump of a lower dump level
are backed up. The /etc/dumpdates file contains
a record of when the dump command was used on
each file system at each dump level. The −u option
to the dump command updates the dumpdates file.
−f
dump_file
Writes the dump to the device specified by
dump_file instead of to the default device,
/dev/rmt0h. When
dump_file is specified as a
dash (-), the dump command writes to the standard
output.
−u
Updates the /etc/dumpdates file with the time of
the dump and the dump level for the file system in
the backup. You use this file during incremental
dumps (by using the dump level option) to
determine which files have changed since a
particular dump level. You can edit the
/etc/dumpdates file to change any record or
fields, if necessary. The dump
(8) reference page
describes the format of this file.
To back up your entire file system to the default backup device, use the
dump command for each file system on your machine. The dump command
has the following command syntax:
dump -0u filesystem
The
filesystem parameter specifies the name of a file system on your
machine. The −0u option causes a level 0 dump and updates the
/etc/dumpdates file with the time and date of the backup for each file
system. This creates an initial point on which to base all future
incremental backups until the next full or level 0 dump. Note that each file
system must be backed up individually.
11–12 Administering the Archiving Services