X-Git-Url: https://git.wh0rd.org/?a=blobdiff_plain;f=dump%2Fdump.8.in;h=2c8b701452702467064d0dbfc0ed7bec77980d9e;hb=ce7243e04b2833c3557f1c97562088349e07f04b;hp=46121c1275dc5ff876dc0b361411c38cb6d886e7;hpb=365a7c7c86abbe2b0a1e76e4e9fc8523bd73a8a1;p=dump.git diff --git a/dump/dump.8.in b/dump/dump.8.in index 46121c1..2c8b701 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 1.14 2000/03/10 10:03:09 stelian Exp $ +.\" $Id: dump.8.in,v 1.22 2001/03/20 20:15:43 stelian Exp $ .\" .Dd __DATE__ .Dt DUMP 8 @@ -51,20 +51,8 @@ .Op Fl L Ar label .Op Fl s Ar feet .Op Fl T Ar date -.Ar filesystem -.Nm dump -.Op Fl 0123456789ackMnSu -.Op Fl B Ar records -.Op Fl b Ar blocksize -.Op Fl d Ar density -.Op Fl e Ar inode number -.Op Fl f Ar file -.Op Fl F Ar script -.Op Fl h Ar level -.Op Fl L Ar label -.Op Fl s Ar feet -.Op Fl T Ar date -.Ar directory +.Op Fl z Ar compression level +.Ar file-to-dump .Nm dump .Op Fl W Li \&| Fl w .Pp @@ -86,19 +74,25 @@ option below for doing remote backups). A dump that is larger than the output medium is broken into multiple volumes. On most media the size is determined by writing until an -end-of-media indication is returned. This can be enforced -by using the -.Fl a -option. +end-of-media indication is returned. .Pp On media that cannot reliably return an end-of-media indication -(such as some cartridge tape drives), -each volume is of a fixed size; -the actual size is determined by the tape size, density and/or -block count options below. +(such as some cartridge tape drives), each volume is of a fixed size; +the actual size is determined by specifying cartridge media, or via the +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 +is either a mountpoint of a filesystem +or a directory 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 . +.Pp The following options are supported by .Nm Ns : .Bl -tag -width Ds @@ -119,16 +113,16 @@ last dump of a lower level. The default level is 9. .It Fl B Ar records The number of 1 KB blocks per volume. -This option overrides the calculation of tape size -based on length and density. +This option overrides the end-of-media detection, and calculation +of tape size based on length and density. .It Fl a .Dq auto-size . -Bypass all tape length considerations, and enforce writing -until an end-of-media indication is returned. This fits best -for most modern tape drives. Use of this option is particularly -recommended when appending to an existing tape, or using a tape -drive with hardware compression (where you can never be sure about -the compression ratio). +Bypass all tape length calculations, and write +until an end-of-media indication is returned. This works best +for most modern tape drives, and is the default. +Use of this option is particularly recommended when appending to an +existing tape, or using a tape drive with hardware compression +(where you can never be sure about the compression ratio). .It Fl b Ar blocksize The number of kilobytes per dump record. Since the IO system slices all requests into chunks of MAXBSIZE @@ -138,9 +132,11 @@ without having problems later with Therefore .Nm dump will constrain writes to MAXBSIZE. +The default blocksize is 10. .It Fl c Change the defaults for use with a cartridge tape drive, with a density -of 8000 bpi, and a length of 1700 feet. +of 8000 bpi, and a length of 1700 feet. Specifying a cartridge drive +overrides the end-of-media detection. .It Fl e Ar inode Exclude .Ar inode @@ -160,7 +156,8 @@ but full backups retain them. .It Fl d Ar density Set tape density to .Ar density . -The default is 1600BPI. +The default is 1600BPI. Specifying a tape density overrides the +end-of-media detection. .It Fl f Ar file Write the backup to .Ar file ; @@ -243,13 +240,13 @@ notify all operators in the group by means similar to a .Xr wall 1 . .It Fl s Ar feet -Attempt to calculate the amount of tape needed -at a particular density. +Attempt to calculate the amount of tape needed at a particular density. If this amount is exceeded, .Nm prompts for a new tape. It is recommended to be a bit conservative on this option. -The default tape length is 2300 feet. +The default tape length is 2300 feet. Specifying the tape size +overrides end-of-media detection. .ne 1i .It Fl S Size estimate. Determine the amount of space @@ -302,10 +299,12 @@ The .Fl W option causes .Nm -to print out, for each file system in +to print out, for all file systems in .Pa __DUMPDATES__ , +and regognized file systems in +.Pa /etc/fstab . the most recent dump date and level, -and highlights those file systems that should be dumped. +and highlights those that should be dumped. If the .Fl W option is set, all other options are ignored, and @@ -314,7 +313,18 @@ exits immediately. .It Fl w Is like .Fl W , -but prints only those filesystems which need to be dumped. +but prints only recognized filesystems in +.Pa /etc/fstab +which need to be dumped. +.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. The (optional) parameter +specifies the compression level zlib will use. The default compression +level is 2. .El .Pp .Nm Dump @@ -462,17 +472,6 @@ Each reel requires a new process, so parent processes for reels already written just hang around until the entire tape is written. .Pp -.Nm Dump -with the -.Fl W -or -.Fl w -option does not report filesystems that have never been recorded -in -.Pa __DUMPDATES__ , -even if listed in -.Pa /etc/fstab . -.Pp It would be nice if .Nm knew about the dump sequence, @@ -497,7 +496,7 @@ of dump (up and including 0.4b4, released in january 1997). .Pp Starting with 0.4b5, the new maintainer is Stelian Pop .br -. +. .Sh AVAILABILITY The .Nm dump/restore