amrestore man page on Scientific

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AMRESTORE(8)		System Administration Commands		  AMRESTORE(8)

       amrestore - extract backup images from an Amanda tape

       amrestore [-r | -c | -C] [-b | blocksize] [-f | fileno] [-l | label]
		 [-p] [-h] tapedevice| holdingfile  [hostname [diskname
		 [datestamp [hostname [diskname [datestamp | ...]]]]]]

       Amrestore extracts backup images from the tape mounted on tapedevice or
       from the holding disk file holdingfile that match hostname, diskname
       and datestamp patterns given on the command line. The tape or holding
       file must be in a format written by the amdump or amflush program.

       If diskname is not specified, all backups on the tape for the previous
       hostname are candidates. If datestamp is not specified, all backups on
       the tape for the previous hostname and diskname are candidates. If no
       hostname, diskname or datestamp are specified, every backup on the tape
       is a candidate.

       Hostname and diskname are special expressions described in the "HOST &
       DISK EXPRESSION" section of amanda(8).  Datestamp are special
       expression described in the "DATESTAMP EXPRESSION" section of
       amanda(8). For example, if diskname is "rz[23]a", it would match disks
       rz2a and rz3a.

       Datestamp is useful if amflush writes multiple backup runs to a single

       Unless -p is used, candidate backup images are extracted to files in
       the current directory named:


       Amrestore doesn´t use a changer, it restore from the tape already
       loaded in the tapedevice.

	   Set the blocksize used to read the tape or holding file. All
	   holding files must be read with a blocksize of 32 KBytes.
	   Amrestore should normally be able to determine the blocksize for
	   tapes on its own and not need this parameter.

       The default is 32 KBytes.

	   Do a rewind followed by a fsf <fileno> before trying to restore an

	   Check if we restoring from the tape with the right label

	   Pipe output. The first matching backup image is sent to standard
	   output, which is normally a pipe to restore or tar, then amrestore
	   quits. It may be run again to continue selecting backups to
	   process. Make sure you specify the no-rewind tapedevice when doing

       Note: restore may report "short read" errors when reading from a pipe.
       Most versions of restore support a blocking factor option to let you
       set the read block size, and you should set it to 2. See the example

	   Compress output using the fastest method the compression program
	   provides.  Amrestore normally writes output files in a format
	   understood by restore or tar, even if the backups on the tape are
	   compressed. With the -c or -C option, amrestore writes all files in
	   compressed format, even if the backups on the tape are not
	   compressed. Output file names will have a .Z or .gz extension
	   depending on whether compress or gzip is the preferred compression
	   program. This option is useful when the current directory disk is

	   Compress output using the best method the compression program
	   provides (may be very CPU intensive). See the notes above about the
	   -c option.

	   Raw output. Backup images are output exactly as they are on the
	   tape, including the amdump headers. Output file names will have a
	   .RAW extension. This option is only useful for debugging and other
	   strange circumstances.

	   Header output. The tape header block is output at the beginning of
	   each file. This is like -r except -c or -C may also be used to
	   compress the result.	 Amrecover uses the header to determine the
	   restore program to use.

       If a header is written (-r or -h), only 32 KBytes are output regardless
       of the tape blocksize. This makes the resulting image usable as a
       holding file.

       -o configoption
	   See the "CONFIGURATION OVERRIDE" section in amanda(8).

       The following does an interactive restore of disk rz3g from host seine,
       to restore particular files. Note the use of the b option to restore,
       which causes it to read in units of two 512-byte blocks (1 Kbyte) at a
       time. This helps keep it from complaining about short reads.

	   % amrestore -p /dev/nrmt9 seine rz3g | restore -ivbf 2 -

       The next example extracts all backup images for host seine. This is the
       usual way to extract all data for a host after a disk crash.

	   % amrestore /dev/nrmt9 seine

       If the backup datestamp in the above example is 19910125 and seine has
       level 0 backups of disks rz1a and rz1g on the tape, these files will be
       created in the current directory:


       You may also use amrestore to extract a backup image from a holding
       disk file that has not yet been flushed to tape:

	   % amrestore -p /amanda/20001119/seine.rz1a.2 | restore -ivbf 2 -

       Amrestore may be used to generate a listing of images on a tape:

	   % mt -f /dev/nrmt9 rewind
	   % amrestore -p /dev/nrmt9 no-such-host > /dev/null

       This asks amrestore to find images for host no-such-host. It will not
       find any entries that match, but along the way will report each image
       it skips.

       GNU-tar must be used to restore files from backup images created with
       the GNUTAR dumptype. Vendor tar programs sometimes fail to read GNU tar

       amanda(8), amdump(8), amflush(8), tar(1), restore(8), :

       James da Silva <>

       Stefan G. Weichinger <>

Amanda 2.6.1p2			  11/05/2009			  AMRESTORE(8)

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