X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=man%2Famrestore.8;h=feb8d4e4db429784aff7f9f41ef4f11d67c69af2;hb=433127ec822be7e32052c69fc51cd35a3ae0e069;hp=e4afea3ad07641cab674165259b34dfcc5669365;hpb=cb8e943df4defb25d0362567131dc31fc0ab238e;p=debian%2Famanda diff --git a/man/amrestore.8 b/man/amrestore.8 index e4afea3..feb8d4e 100644 --- a/man/amrestore.8 +++ b/man/amrestore.8 @@ -18,149 +18,238 @@ .IP "\\$1" \\$2 .. .TH "AMRESTORE" 8 "" "" "" -.SH NAME -amrestore \- extract backup images from an Amanda tape +.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 - +\fBamrestore\fR [-r -c -C] [-b \fIblocksize\fR] [-f \fIfileno\fR] [-l \fIlabel\fR] [-p] [-h] \fItapedevice\fR \fIholdingfile\fR [\fIhostname\fR [\fIdiskname\fR [\fIdatestamp\fR [\fIhostname\fR [\fIdiskname\fR [\fIdatestamp\fR...]]]]]] .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 - +\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\&. - +\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\&. - +The default is 32 KBytes. .TP -\fB\-f\fR -Do a rewind followed by a fsf before trying to restore an image\&. - +\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 - +\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\&. - +\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\&. - +\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\&. - +\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\&. - +\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\&. - +\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\&. - +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. +.sp .nf -% amrestore \-p /dev/nrmt9 seine rz3g | restore \-ivbf 2 \- +% amrestore -p /dev/nrmt9 seine rz3g | restore -ivbf 2 - .fi - +.sp .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\&. - +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. +.sp .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: - +.sp +.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: +.sp .nf -seine\&.rz1a\&.19910125\&.0 -seine\&.rz1g\&.19910125\&.0 +seine.rz1a.19910125.0 +seine.rz1g.19910125.0 .fi - +.sp .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: - +You may also use +\fBamrestore\fR +to extract a backup image from a holding disk file that has not yet been flushed to tape: +.sp .nf -% amrestore \-p /amanda/20001119/seine\&.rz1a\&.2 | restore \-ivbf 2 \- +% amrestore -p /amanda/20001119/seine.rz1a.2 | restore -ivbf 2 - .fi - +.sp .PP -\fBAmrestore\fR may be used to generate a listing of images on a tape: - +\fBAmrestore\fR +may be used to generate a listing of images on a tape: +.sp .nf -% mt \-f /dev/nrmt9 rewind -% amrestore \-p /dev/nrmt9 no\-such\-host > /dev/null +% mt -f /dev/nrmt9 rewind +% amrestore -p /dev/nrmt9 no-such-host > /dev/null .fi - +.sp .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\&. - +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\&. - +\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 - +James da Silva, +, University of Maryland, College Park: Original text .PP -Stefan G\&. Weichinger, , maintainer of the \fBAmanda\fR\-documentation: XML\-conversion - +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) +\fBamanda\fR(8), +\fBamdump\fR(8), +\fBamflush\fR(8), +\fBtar\fR(1)\fBrestore\fR(8)