.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
-.\" must display the following acknowledgment:
+.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" SUCH DAMAGE.
.\"
.\" @(#)dump.8 8.3 (Berkeley) 5/1/95
-.\" $Id: dump.8,v 1.2 1999/10/11 12:53:21 stelian Exp $
+.\" $Id: dump.8,v 1.3 1999/10/11 12:59:18 stelian Exp $
.\"
-.Dd May 1, 1995
+.Dd June 4, 1997
.Dt DUMP 8
.Os BSD 4
.Sh NAME
.Nm dump
-.Nd filesystem backup
+.Nd ext2 filesystem backup
.Sh SYNOPSIS
.Nm dump
.Op Fl 0123456789acknu
.in -\\n(iSu
(The
.Bx 4.3
-option syntax is implemented for backward compatibility, but
+option syntax is implemented for backward compatibility but
is not documented here.)
.Sh DESCRIPTION
.Nm Dump
examines files
-on a filesystem
+on an ext2 filesystem
and determines which files
need to be backed up. These files
are copied to the given disk, tape or other
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
+end-of-media indication is returned. This can be enforced
by using the
.Fl a
option.
.Pp
On media that cannot reliably return an end-of-media indication
-(such as some cartridge tape drives)
+(such as some cartridge tape drives),
each volume is of a fixed size;
-the actual size is determined by the tape size and density and/or
+the actual size is determined by 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.
option below).
A level number above 0,
incremental backup,
-tells dump to
+tells
+.Nm dump
+to
copy all files new or modified since the
-last dump of any lower level.
-The default level is 0.
+last dump of the same or 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
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
+(typically 64KB), it is not possible to use a larger blocksize
+without having problems later with
+.Xr restore 8 .
+Therefore
+.Nm dump
+will constrain writes to MAXBSIZE.
.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.
.Ar file
may be a special device file
like
-.Pa /dev/rmt12
+.Pa /dev/st0
(a tape drive),
.Pa /dev/rsd1c
(a floppy disk drive),
the last file name will used for all remaining volumes after prompting
for media changes.
If the name of the file is of the form
-.Dq host:file ,
+.Dq host:file
or
-.Dq user@host:file ,
+.Dq user@host:file
.Nm
writes to the named file on the remote host using
.Xr rmt 8 .
Use the specified date as the starting time for the dump
instead of the time determined from looking in
.Pa /etc/dumpdates .
-The format of date is the same as that of
+The format of
+.Ar date
+is the same as that of
.Xr ctime 3 .
This option is useful for automated dump scripts that wish to
dump over a specific period of time.
option causes
.Nm
to print out, for each file system in
-.Pa /etc/dumpdates
+.Pa /etc/dumpdates ,
the most recent dump date and level,
and highlights those file systems that should be dumped.
If the
.Nm
exits immediately.
.It Fl w
-Is like W, but prints only those filesystems which need to be dumped.
+Is like
+.Fl W ,
+but prints only those filesystems which need to be dumped.
.El
.Pp
.Nm Dump
end of dump,
tape write error,
tape open error or
-disk read error (if there are more than a threshold of 32).
+disk read error (if there is more than a threshold of 32).
In addition to alerting all operators implied by the
.Fl n
key,
program.
.Sh FILES
.Bl -tag -width /etc/dumpdates -compact
-.It Pa /dev/rmt8
+.It Pa /dev/st0
default tape unit to dump to
.It Pa /etc/dumpdates
dump date records
.Sh DIAGNOSTICS
Many, and verbose.
.Pp
-Dump exits with zero status on success.
+.Nm Dump
+exits with zero status on success.
Startup errors are indicated with an exit code of 1;
abnormal termination is indicated with an exit code of 3.
.Sh BUGS
-Fewer than 32 read errors on the filesystem are ignored.
+It might be considered a bug that this version of dump can only handle ext2
+filesystems. Specifically, it does not work with FAT filesystems.
+.Pp
+Fewer than 32 read errors on the filesystem are ignored. If noticing
+read errors is important, the output from dump can be parsed to look for lines
+that contain the text 'read error'.
.Pp
Each reel requires a new process, so parent processes for
reels already written just hang around until the entire tape
.Fl W
or
.Fl w
-options does not report filesystems that have never been recorded
+option does not report filesystems that have never been recorded
in
.Pa /etc/dumpdates ,
even if listed in
git.wh0rd.org / dump.git / blobdiff