AMFETCHDUMP(8) System Administration Commands AMFETCHDUMP(8)NAMEamfetchdump - extract backup images from multiple Amanda tapes.
SYNOPSISamfetchdump [-pcClawns] [-d device] [-O directory] [-b blocksize]
config hostname
[disk [ date [ level [ hostname [...] ] ] ]]
[-o configoption]...
DESCRIPTION
Amfetchdump pulls one or more matching dumps from tape or from the
holding disk, handling the reassembly of multi-tape split dump files as
well as any tape autochanger operations.
It will automatically use the logs created by amdump(8) to locate
available dumps on tape, in the same way that the find feature of
amadmin(8) lists available dumps. If these logs are unavailable, it can
search tape-by-tape to find what it needs, and can generate new logs to
serve as an emergency tape inventory.
The hostname, diskname, datestamp, and level dump pattern-matching
works as in amrestore(8), with the added requirement that at minimum a
hostname must be specified when not in inventory mode.
Unless -p is used, backup images are extracted to files in the current
directory named:
hostname.diskname.datestamp.dumplevel
OPTIONS-p
Pipe exactly one complete dump file to stdout, instead of writing
the file to disk. This will restore only the first matching
dumpfile (where "first" is determined by the dump log search
facility).
-d device
Restore from this tape device instead of the default.
-O directory
Output restored files to this directory, instead of to the current
working directory.
-c
Compress output, fastest method available.
-C
Compress output, smallest file size method available.
-l
Leave dumps in the compressed/uncompressed state in which they were
found on tape. By default, amfetchdump will automatically
uncompress when restoring.
-a
Assume that all tapes are already available, via tape changer or
otherwise, instead of prompting the operator to ensure that all
tapes are loaded.
-w
Wait to put split dumps together until all chunks have been
restored. Normally, amfetchdump will attempt to read pieces of a
split file from tape in order, so that it can assemble them simply
by appending each file to the first. This option disables the
appending behavior, and instead restores each piece as an
individual file and reassembles them only after all have been
restored.
Note
This requires at least double the size of your dump in free
disk space, in order to build the final assembled dumpfile.
This behavior is implicitly invoked in circumstances where knowing
the location of all dumps on tape in advance is not possible, such
as when you are restoring without log files.
-n
Do not reassemble split dump files at all, just restore each piece
as an individual file.
-s
Do not fast-forward straight to needed files on tape. This will
slow down most restores substantially. Only use this option if your
tape drive does not properly support the fast-forward operation.
-b blocksize
Force a particular block size when reading from tapes. This value
will usually be autodetected, and should not normally need to be
set.
-o configoption
See the "CONFIGURATION OVERRIDE" section in amanda(8).
EXAMPLES
All the examples here assume your configuration is called SetA.
Here´s a simple case, restoring all known dumps of the host vanya to
the current working directory.
$ amfetchdump SetA vanya
A more likely scenario involves restoring a particular dump from a
particular date. We´ll pipe this one to GNU-tar as well, to
automatically extract the dump.
$ amfetchdump-p SetA vanya /home 20051020 | gtar -xvpf -
CAVEATS
Amfetchdump is dependent on accessing your server´s config, tape
changer, and (normally) dump logs. As such, it´s not necessarily the
most useful tool when those have all been wiped out and you desperately
need to pull things from your tape. Pains have been taken to make it as
capable as possible, but for seriously minimialist restores, look to
amrestore(8) or dd(8) instead.
SEE ALSOamanda(8), amadmin(8), amrestore(8), tar(1), restore(8), :
http://wiki.zmanda.com
AUTHORS
John Stange <building@nap.edu>
National Academies Press
Ian Turner <ian@zmanda.com>
Zmanda, Inc. (http://www.zmanda.com)
Amanda 2.6.1p2 11/05/2009 AMFETCHDUMP(8)
