.\"Generated by db2man.xsl. Don't modify this, modify the source. .de Sh \" Subsection .br .if t .Sp .ne 5 .PP \fB\\$1\fR .PP .. .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Ip \" List item .br .ie \\n(.$>=3 .ne \\$3 .el .ne 3 .IP "\\$1" \\$2 .. .TH "AMRESTORE" 8 "" "" "" .SH NAME amrestore \- extract backup images from an Amanda tape .SH "SYNOPSIS" .ad l .hy 0 .HP 10 \fBamrestore\fR [\fB\-r\fR | \fB\-c\fR | \fB\-C\fR] [\-b\ \fIblocksize\fR] [\-f\ \fIfileno\fR] [\-l\ \fIlabel\fR] [\-p] [\-h] \fB\fItapedevice\fR\fR | \fB\fIholdingfile\fR\fR | \fB\fIhostname\fR\ [\fIdiskname\fR\ [\fIdatestamp\fR]]\fR \&.\&.\&. .ad .hy .SH "DESCRIPTION" .PP \fBAmrestore\fR extracts backup images from the tape mounted on \fBtapedevice\fR or from the holding disk file \fBholdingfile\fR that match \fBhostname\fR, \fBdiskname\fR and \fBdatestamp\fR patterns given on the command line\&. The tape or holding file must be in a format written by the \fBamdump\fR or \fBamflush\fR program\&. .PP If \fBdiskname\fR is not specified, all backups on the tape for the previous \fBhostname\fR are candidates\&. If \fBdatestamp\fR is not specified, all backups on the tape for the previous \fBhostname\fR and \fBdiskname\fR are candidates\&. If no \fBhostname\fR, \fBdiskname\fR or \fBdatestamp\fR are specified, every backup on the tape is a candidate\&. .PP \fBHostname\fR and \fBdiskname\fR are special expressions described in the "HOST & DISK EXPRESSION" section of \fBamanda\fR(8)\&. \fBDatestamp\fR are special expression described in the "DATESTAMP EXPRESSION" section of \fBamanda\fR(8)\&. For example, if \fBdiskname\fR is "rz[23]a", it would match disks \fBrz2a\fR and \fBrz3a\fR\&. .PP \fBDatestamp\fR is useful if \fBamflush\fR writes multiple backup runs to a single tape\&. .PP Unless \fB\-p\fR is used, candidate backup images are extracted to files in the current directory named: .PP \fBhostname\&.diskname\&.datestamp\&.dumplevel\fR .PP Amrestore doesn't use a changer, it restore from the tape already loaded in the \fBtapedevice\&.\fR .SH "OPTIONS" .TP \fB\-b\fR Set the blocksize used to read the tape or holding file\&. All holding files must be read with a blocksize of 32 KBytes\&. \fBAmrestore\fR should normally be able to determine the blocksize for tapes on its own and not need this parameter\&. .PP The default is 32 KBytes\&. .TP \fB\-f\fR Do a rewind followed by a fsf before trying to restore an image\&. .TP \fB\-l\fR Check if we restoring from the tape with the right \fBlabel\fR .TP \fB\-p\fR Pipe output\&. The first matching backup image is sent to standard output, which is normally a pipe to \fBrestore\fR or \fBtar\fR, then \fBamrestore\fR quits\&. It may be run again to continue selecting backups to process\&. Make sure you specify the no\-rewind \fBtapedevice\fR when doing this\&. .PP Note: \fBrestore\fR may report "short read" errors when reading from a pipe\&. Most versions of \fBrestore\fR support a blocking factor option to let you set the read block size, and you should set it to 2\&. See the example below\&. .TP \fB\-c\fR Compress output using the fastest method the compression program provides\&. \fBAmrestore\fR normally writes output files in a format understood by \fBrestore\fR or \fBtar\fR, even if the backups on the tape are compressed\&. With the \fB\-c\fR or \fB\-C\fR option, \fBamrestore\fR 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 \fBcompress\fR or \fBgzip\fR is the preferred compression program\&. This option is useful when the current directory disk is small\&. .TP \fB\-C\fR Compress output using the best method the compression program provides (may be very CPU intensive)\&. See the notes above about the \fB\-c\fR option\&. .TP \fB\-r\fR Raw output\&. Backup images are output exactly as they are on the tape, including the \fBamdump\fR headers\&. Output file names will have a \&.RAW extension\&. This option is only useful for debugging and other strange circumstances\&. .TP \fB\-h\fR Header output\&. The tape header block is output at the beginning of each file\&. This is like \fB\-r\fR except \fB\-c\fR or \fB\-C\fR may also be used to compress the result\&. \fBAmrecover\fR uses the header to determine the restore program to use\&. .PP 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\&. .SH "EXAMPLES" .PP The following does an interactive restore of disk \fBrz3g\fR from host \fBseine\fR, to restore particular files\&. Note the use of the \fBb\fR option to \fBrestore\fR, 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\&. .nf % amrestore \-p /dev/nrmt9 seine rz3g | restore \-ivbf 2 \- .fi .PP The next example extracts all backup images for host \fBseine\fR\&. This is the usual way to extract all data for a host after a disk crash\&. .nf % amrestore /dev/nrmt9 seine .fi .PP If the backup datestamp in the above example is 19910125 and \fBseine\fR has level 0 backups of disks \fBrz1a\fR and \fBrz1g\fR on the tape, these files will be created in the current directory: .nf seine\&.rz1a\&.19910125\&.0 seine\&.rz1g\&.19910125\&.0 .fi .PP You may also use \fBamrestore\fR to extract a backup image from a holding disk file that has not yet been flushed to tape: .nf % amrestore \-p /amanda/20001119/seine\&.rz1a\&.2 | restore \-ivbf 2 \- .fi .PP \fBAmrestore\fR may be used to generate a listing of images on a tape: .nf % mt \-f /dev/nrmt9 rewind % amrestore \-p /dev/nrmt9 no\-such\-host > /dev/null .fi .PP This asks \fBamrestore\fR to find images for host \fBno\-such\-host\fR\&. It will not find any entries that match, but along the way will report each image it skips\&. .SH "CAVEATS" .PP \fBGNU\-tar\fR must be used to restore files from backup images created with the GNUTAR dumptype\&. Vendor tar programs sometimes fail to read GNU tar images\&. .SH "AUTHOR" .PP James da Silva, , University of Maryland, College Park: Original text .PP Stefan G\&. Weichinger, , maintainer of the \fBAmanda\fR\-documentation: XML\-conversion .SH "SEE ALSO" .PP \fBamanda\fR(8), \fBamdump\fR(8), \fBamflush\fR(8), \fBtar\fR(1) \fBrestore\fR(8)