X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=man%2Famrestore.8;h=3c7c540d1e6b3541abb070d5b4d0128b6210ab87;hb=b116e9366c7b2ea2c2eb53b0a13df4090e176235;hp=feb8d4e4db429784aff7f9f41ef4f11d67c69af2;hpb=94c03cae686e4196a345d72452fda2a5203768ce;p=debian%2Famanda diff --git a/man/amrestore.8 b/man/amrestore.8 index feb8d4e..3c7c540 100644 --- a/man/amrestore.8 +++ b/man/amrestore.8 @@ -1,255 +1,176 @@ -.\"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 "" "" "" +'\" t +.\" Title: amrestore +.\" Author: James da Silva +.\" Generator: DocBook XSL Stylesheets vsnapshot_8273 +.\" Date: 10/18/2010 +.\" Manual: System Administration Commands +.\" Source: Amanda 3.2.0 +.\" Language: English +.\" +.TH "AMRESTORE" "8" "10/18/2010" "Amanda 3\&.2\&.0" "System Administration Commands" +.\" ----------------------------------------------------------------- +.\" * set default formatting +.\" ----------------------------------------------------------------- +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.\" ----------------------------------------------------------------- +.\" * MAIN CONTENT STARTS HERE * +.\" ----------------------------------------------------------------- .SH "NAME" -amrestore - extract backup images from an Amanda tape +amrestore \- low\-level data\-extraction from Amanda volumes .SH "SYNOPSIS" -.HP 10 -\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...]]]]]] +.HP \w'\fBamrestore\fR\ 'u +\fBamrestore\fR [\-\-config\ \fIconfig\fR] [\-r | \-c | \-C] [\-b\ \fIblocksize\fR] [\-f\ \fIfilenum\fR] [\-l\ \fIlabel\fR] [\-p] [\-h] [\fB\-o\fR\ \fIconfigoption\fR...] [{\fIchangerspec\fR} | {[\-\-holding]\ \fIholdingfile\fR}] [\fIhostname\fR\ [\ \fIdiskname\fR\ [\ \fIdatestamp\fR\ [\ \fIhostname\fR\ [\ \fIdiskname\fR\ [\ \fIdatestamp\fR\ \&.\&.\&.\ ]\ ]\ ]\ ]\ ]] +.PP +Note that this is the only Amanda command which does not take a configuration name as its first argument\&. .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. +\fIAmrestore\fR +is a very low\-level tool for extracting data from Amanda volumes\&. It does not consult any catalog information or other metadata, basing its operations only on the headers found on the volume\&. This makes it an appropriate tool for bare\-metal restores of an Amanda server, or other situations where the catalog is not available\&. .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 +See +\fBamfetchdump\fR(8) and -\fBrz3a\fR. +\fBamrecover\fR(8) +for higher\-level recoveries\&. .PP -\fBDatestamp\fR -is useful if -\fBamflush\fR -writes multiple backup runs to a single tape. +The tool does not reassemble split dumps, but can uncompress compressed dumps\&. Note that decompression may fail for split parts after the first\&. If this occurs, extract the parts without decompressing, concatenate them, and decompress the result\&. .PP -Unless -\fB-p\fR -is used, candidate backup images are extracted to files in the current directory named: +Data is restored from the current volume in +\fIchangerspec\fR, or from the holding file +\fIholdingfile\fR\&. In most cases, +\fIchangerspec\fR +will name a particular device, e\&.g\&., +tape:/dev/nst0 +or +s3:mybucket/tape\-1\&. .PP -\fBhostname.diskname.datestamp.dumplevel\fR +Only dumps matching the dump specification beginning with +\fIhostname\fR +are extracted\&. If no specification is given, every file on the volume (or the entire holdingfile) is restored\&. See the "DUMP SPECIFICATIONS" section of +\fBamanda-match\fR(7) +for more information\&. .PP -Amrestore doesn't use a changer, it restore from the tape already loaded in the -\fBtapedevice.\fR +Unless +\fB\-p\fR +is used, candidate backup images are extracted to files in the current directory named: +hostname\&.diskname\&.datestamp\&.dumplevel .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 +.PP +\fB\-b \fR\fB\fIblocksize\fR\fR +.RS 4 +Use the given blocksize to read the volume\&. The default is defined by the device\&. +.RE +.PP +\fB\-f \fR\fB\fIfilenum\fR\fR +.RS 4 +Seek to file +\fIfilenum\fR +before beginning the restore operation\&. +.RE +.PP +\fB\-l \fR\fB\fIlabel\fR\fR +.RS 4 +Check that the volume has label +\fIlabel\fR\&. +.RE +.PP +\fB\-p\fR +.RS 4 +Pipe the first matching file to standard output\&. This is typically used in a shell pipeline to send the data to a process like +\fBtar\fR +for extraction\&. +.RE +.PP +\fB\-c\fR, \fB\-C\fR +.RS 4 +If the file is not already compressed, compress it using the fastest (\fB\-c\fR) or best (\fB\-C\fR) compression algorithm\&. Note that \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, +will not re\-compress an already\-compressed file\&. Without either of these options, \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. +will automatically uncompress any compressed files\&. This option is useful when the destination disk is small\&. +.RE +.PP +\fB\-h\fR +.RS 4 +Include 32k headers on all output files, similar to a holding file\&. This header can be read by another application or utility (see +\fBAmanda::Header\fR) during the next phase of processing\&. +.RE +.PP +\fB\-r\fR +.RS 4 +Output raw files\&. This is similar to +\fB\-h\fR, but also disables any automatic decompression\&. Output file names will have a +\&.RAW +extension\&. +.RE +.PP +\fB\-o \fR\fB\fIconfigoption\fR\fR +.RS 4 +See the "CONFIGURATION OVERRIDE" section in +\fBamanda\fR(8)\&. +.RE .SH "EXAMPLES" .PP The following does an interactive restore of disk -\fBrz3g\fR +\fIrz3g\fR from host -\fBseine\fR, to restore particular files. Note the use of the -\fBb\fR +\fIseine\fR, to restore particular files\&. Note the use of the +\fIb\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 +\fIrestore\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 - - + amrestore \-p /dev/nrmt9 seine rz3g | tar \-xv .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. -.sp +\fIseine\fR\&. This is a typical way to extract all data for a host after a disk crash\&. .nf - -% amrestore /dev/nrmt9 seine - + amrestore /dev/nrmt9 seine .fi -.sp .PP If the backup datestamp in the above example is -19910125 +20070125 and -\fBseine\fR +\fIseine\fR has level 0 backups of disks -\fBrz1a\fR +\fIrz1a\fR and -\fBrz1g\fR +\fIrz1g\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: -.sp .nf - -% amrestore -p /amanda/20001119/seine.rz1a.2 | restore -ivbf 2 - - + amrestore \-p /amanda/20001119/seine\&.rz1a\&.2 | tar \-xv .fi -.sp +.SH "CAVEATS" .PP -\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 - -.fi -.sp +\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 "SEE ALSO" .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" +\fBamanda\fR(8), +\fBamanda-match\fR(7), +\fBamfetchdump\fR(8), +\fBamrecover\fR(8) .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" +The Amanda Wiki: +: http://wiki.zmanda.com/ +.SH "AUTHORS" .PP -James da Silva, -, University of Maryland, College Park: Original text +\fBJames da Silva\fR <\&jds@amanda\&.org\&> .PP -Stefan G. Weichinger, -, maintainer of the -\fBAmanda\fR-documentation: XML-conversion -.SH "SEE ALSO" +\fBStefan G\&. Weichinger\fR <\&sgw@amanda\&.org\&> .PP -\fBamanda\fR(8), -\fBamdump\fR(8), -\fBamflush\fR(8), -\fBtar\fR(1)\fBrestore\fR(8) - +\fBDustin J\&. Mitchell\fR <\&dustin@zmanda\&.com\&> +.RS 4 +Zmanda, Inc\&. (http://www\&.zmanda\&.com) +.RE