A-30 Dell PowerVault 720N, 740N, and 760N System Administrator and Command Reference Guide
Another advantage of running the dump command through rsh is that you can
control backups from UNIX shell scripts or crontab entries.
OPTIONS
0-9Dump levels. A level 0, full backup, guarantees the entire file system is
copied. A level number above 0, incremental backup, tells dump to copy
all files new or modified since the last dump of a lower level. The default
level is 0.
f files Write the backup to the specified files. files may be:
a list of the names of local tape devices, in the form specified in tape;
a list of the names of tape devices on a remote host, in the form
host:devices;
the standard output of the dump command, specified as -.
The list may have a single device or a comma-separated list of devices;
note that the list must either contain only local devices or only devices
on a remote host and, in the latter case, must refer to devices on one
particular remote host, e.g.
tapemachine:/dev/rst0,/dev/rst1
Each file in the list will be used for one dump volume in the order listed;
if the dump requires more volumes than the number of names given,
the last file name will used for all remaining volumes after prompting for
media changes.
Use sysconfig -t for a list of local tape devices. See below for an exam-
ple of a dump to local tape.
For a dump to a tape device on a remote host, host must support the
standard UNIX rmt remote tape protocol.
By default, dump writes to standard output.
B blocksSet the size of the dump file to the specified number of 1024-byte
blocks, If this amount is exceeded, dump will close the current file and
open the next file in the list specified by the f option. If there are no
more files in that list, dump will re-open the last file in the list, and
prompt for a new tape to be loaded.
It is recommended to be a bit conservative on this option.
This is one way to allow dump to work with remote tape devices that
are limited to 2 GB of data per tape file.
uUpdate the file /etc/dumpdates after a successful dump. The format of
/etc/dumpdates is readable by people. It consists of one free format
record per line: subtree, increment level and ctime format dump date.
There may be only one entry per subtree at each level. The dump date is
defined as the creation date of the snapshot being dumped. The file
dump