X-Git-Url: https://git.wh0rd.org/?p=dump.git;a=blobdiff_plain;f=dump%2Fdump.8.in;h=a3763a52ac352d83f7be423d94f55dceb8705231;hp=4969b66307ce69ad3585b397692d46e38125b68b;hb=b8f7cbe65e70f2ec792c447995ba00ca360ec0c9;hpb=2b7475327b6a1a580f76eca13a18f68a2943a5b1 diff --git a/dump/dump.8.in b/dump/dump.8.in index 4969b66..a3763a5 100644 --- a/dump/dump.8.in +++ b/dump/dump.8.in @@ -30,7 +30,7 @@ .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" -.\" $Id: dump.8.in,v 1.21 2001/03/18 15:35:44 stelian Exp $ +.\" $Id: dump.8.in,v 1.29 2001/07/18 13:12:33 stelian Exp $ .\" .Dd __DATE__ .Dt DUMP 8 @@ -40,7 +40,7 @@ .Nd ext2 filesystem backup .Sh SYNOPSIS .Nm dump -.Op Fl 0123456789ackMnSuz +.Op Fl 0123456789ackMnSu .Op Fl B Ar records .Op Fl b Ar blocksize .Op Fl d Ar density @@ -49,9 +49,11 @@ .Op Fl F Ar script .Op Fl h Ar level .Op Fl L Ar label +.Op Fl Q Ar file .Op Fl s Ar feet .Op Fl T Ar date -.Ar file-to-dump +.Op Fl z Ar compression level +.Ar files-to-dump .Nm dump .Op Fl W Li \&| Fl w .Pp @@ -82,15 +84,17 @@ tape size, density and/or block count options below. By default, the same output file name is used for each volume after prompting the operator to change media. .Pp -.Ar file-to-dump +.Ar files-to-dump is either a mountpoint of a filesystem -or a directory to be backed up as a subset of a filesystem. +or a list of files and directories to be backed up as a subset of a +filesystem. In the former case, either the path to a mounted filesystem or the device of an unmounted filesystem can be used. In the latter case, certain restrictions are placed on the backup: .Fl u -is not allowed and the only dump level that is supported is -.Fl 0 . +is not allowed, the only dump level that is supported is +.Fl 0 +and all the files and directories must reside on the same filesystem. .Pp The following options are supported by .Nm Ns : @@ -111,9 +115,10 @@ copy all files new or modified since the last dump of a lower level. The default level is 9. .It Fl B Ar records -The number of 1 KB blocks per volume. +The number of 1 kB blocks per volume. This option overrides the end-of-media detection, and calculation -of tape size based on length and density. +of tape size based on length and density. If compression is on this +limits the size of the compressed output per volume. .It Fl a .Dq auto-size . Bypass all tape length calculations, and write @@ -125,7 +130,7 @@ existing tape, or using a tape drive with hardware compression .It Fl b Ar blocksize The number of kilobytes per dump record. Since the IO system slices all requests into chunks of MAXBSIZE -(typically 64KB), it is not possible to use a larger blocksize +(typically 64kB), it is not possible to use a larger blocksize without having problems later with .Xr restore 8 . Therefore @@ -197,7 +202,7 @@ The script must return 0 if .Nm should continue without asking the user to change the tape, 1 if .Nm -dump should continue but ask the user to change the tape. +should continue but ask the user to change the tape. Any other exit code will cause .Nm to abort. @@ -238,6 +243,26 @@ notify all operators in the group .Dq operator by means similar to a .Xr wall 1 . +.It Fl Q Ar file +Enable the Quick File Access support. Tape positions for each +inode are stored into the file +.Ar file +which is used by restore (if called with parameter Q and the filename) +to directly position the tape at the file restore is currently working +on. This saves hours when restoring single files from large backups, +saves the tapes and the drive's head. +.Pp +It is recommended to set up the st driver to return logical tape +positions rather than physical before calling dump/restore with +parameter Q. Since not all tape devices support physical tape +positions those tape devices return an error during dump/restore when +the st driver is set to the default physical setting. +Please see the st man page, option MTSETDRVBUFFER, or the mt man +page, on how to set the driver to return logical tape positions. +.Pp +Before calling restore with parameter Q, always make sure the st +driver is set to return the same type of tape position used during the +call to dump. Otherwise restore may be confused. .It Fl s Ar feet Attempt to calculate the amount of tape needed at a particular density. If this amount is exceeded, @@ -315,13 +340,15 @@ Is like but prints only recognized filesystems in .Pa /etc/fstab which need to be dumped. -.It Fl z +.It Fl z Ar compression level Compress every block to be written on the tape using zlib library. This option will work only when dumping to a file or pipe or, when dumping to a tape drive, if the tape drive is capable of writing variable length blocks. You will need at least the 0.4b22 version of restore in order to extract compressed tapes. Tapes written using compression will -not be compatible with the BSD tape format. +not be compatible with the BSD tape format. The (optional) parameter +specifies the compression level zlib will use. The default compression +level is 2. .El .Pp .Nm Dump @@ -469,6 +496,8 @@ Each reel requires a new process, so parent processes for reels already written just hang around until the entire tape is written. .Pp +The estimated number of tapes is not correct if compression is on. +.Pp It would be nice if .Nm knew about the dump sequence, @@ -487,7 +516,7 @@ a remote shell program instead. .Sh AUTHOR The .Nm dump/restore -backup suit was ported to Linux's Second Extended File System +backup suite was ported to Linux's Second Extended File System by Remy Card . He maintained the initial versions of dump (up and including 0.4b4, released in january 1997). .Pp @@ -497,7 +526,7 @@ Starting with 0.4b5, the new maintainer is Stelian Pop .Sh AVAILABILITY The .Nm dump/restore -backup suit is available from +backup suite is available from .br http://dump.sourceforge.net .Sh HISTORY