amrestore(8)

1AMRESTORE(8)            System Administration Commands            AMRESTORE(8)
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NAME

6       amrestore - low-level data-extraction from Amanda volumes
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SYNOPSIS

9       amrestore [--config config] [-r | -c | -C] [-b blocksize] [-f filenum]
10                 [-l label] [-p] [-h] [--exact-match]
11                 [--continue-on-filter-error] [-o configoption...]
12                 [{changerspec} | {[--holding] holdingfile}]
13                 [hostname [ diskname [ datestamp [ hostname [ diskname [ datestamp ... ] ] ] ] ]]
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15       Note that this is the only Amanda command which does not take a
16       configuration name as its first argument.
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DESCRIPTION

19       Amrestore is a very low-level tool for extracting data from Amanda
20       volumes. It does not consult any catalog information or other metadata,
21       basing its operations only on the headers found on the volume. This
22       makes it an appropriate tool for bare-metal restores of an Amanda
23       server, or other situations where the catalog is not available.
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25       See amfetchdump(8) and amrecover(8) for higher-level recoveries.
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27       The tool does not reassemble split dumps, but can uncompress compressed
28       dumps. Note that decompression may fail for split parts after the
29       first. If this occurs, extract the parts without decompressing,
30       concatenate them, and decompress the result.
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32       Data is restored from the current volume in changerspec, or from the
33       holding file holdingfile. In most cases, changerspec will name a
34       particular device, e.g., tape:/dev/nst0 or s3:mybucket/tape-1.
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36       Only dumps matching the dump specification beginning with hostname are
37       extracted. If no specification is given, every file on the volume (or
38       the entire holdingfile) is restored. See the "DUMP SPECIFICATIONS"
39       section of amanda-match(7) for more information.
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41       Unless -p is used, candidate backup images are extracted to files in
42       the current directory named: hostname.diskname.datestamp.dumplevel
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OPTIONS

45       -b blocksize
46           Use the given blocksize to read the volume. The default is defined
47           by the device.
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49       -f filenum
50           Seek to file filenum before beginning the restore operation.
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52       -l label
53           Check that the volume has label label.
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55       -p
56           Pipe the first matching file to standard output. This is typically
57           used in a shell pipeline to send the data to a process like tar for
58           extraction.
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60       -c, -C
61           If the file is not already compressed, compress it using the
62           fastest (-c) or best (-C) compression algorithm. Note that
63           amrestore will not re-compress an already-compressed file. Without
64           either of these options, amrestore will automatically uncompress
65           any compressed files. This option is useful when the destination
66           disk is small.
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68       -h
69           Include 32k headers on all output files, similar to a holding file.
70           This header can be read by another application or utility (see
71           Amanda::Header) during the next phase of processing.
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73       -r
74           Output raw files. This is similar to -h, but also disables any
75           automatic decompression and/or decryption. Output file names will
76           have a .RAW extension.
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78       --exact-match
79           The host and disk are parsed as exact values.
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81       --continue-on-filter-error
82           continue to the next dump if a filter (decompression/decryption)
83           fail.
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85       -o configoption
86           See the "CONFIGURATION OVERRIDE" section in amanda(8).
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EXAMPLES

89       The following does an interactive restore of disk rz3g from host seine,
90       to restore particular files. Note the use of the b option to restore,
91       which causes it to read in units of two 512-byte blocks (1 Kbyte) at a
92       time. This helps keep it from complaining about short reads.
93         amrestore -p /dev/nrmt9 seine rz3g | tar -xv
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95       The next example extracts all backup images for host seine. This is a
96       typical way to extract all data for a host after a disk crash.
97         amrestore /dev/nrmt9 seine
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99       If the backup datestamp in the above example is 20070125 and seine has
100       level 0 backups of disks rz1a and rz1g on the tape, these files will be
101       created in the current directory:
102         seine.rz1a.19910125.0
103         seine.rz1g.19910125.0
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105       You may also use amrestore to extract a backup image from a holding
106       disk file that has not yet been flushed to tape:
107         amrestore -p /amanda/20001119/seine.rz1a.2 | tar -xv
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CAVEATS

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

120       James da Silva <jds@amanda.org>
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122       Stefan G. Weichinger <sgw@amanda.org>
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124       Dustin J. Mitchell <dustin@zmanda.com>
125           Zmanda, Inc. (http://www.zmanda.com)
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129Amanda 3.5.1                      12/01/2017                      AMRESTORE(8)