X-Git-Url: https://git.wh0rd.org/?p=dump.git;a=blobdiff_plain;f=dump%2Fdump.8.in;h=4f30fabf8c9e51a18bb25c8caae60ad40ea52dea;hp=400eff20a493cc13be74367a24b576bffd34129e;hb=HEAD;hpb=2ec40843dd2fb1992724d6fda2d45588e8ff5df3 diff --git a/dump/dump.8.in b/dump/dump.8.in index 400eff2..4f30fab 100644 --- a/dump/dump.8.in +++ b/dump/dump.8.in @@ -26,11 +26,11 @@ .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" -.\" $Id: dump.8.in,v 1.59 2006/08/01 10:22:44 stelian Exp $ +.\" $Id: dump.8.in,v 1.63 2010/03/08 10:57:24 stelian Exp $ .\" .TH DUMP 8 "version __VERSION__ of __DATE__" BSD "System management commands" .SH NAME -dump \- ext2/3 filesystem backup +dump \- ext2/3/4 filesystem backup .SH SYNOPSIS .B dump [\fB\-\fIlevel#\fR] @@ -59,7 +59,7 @@ dump \- ext2/3 filesystem backup [\fB\-W \fR| \fB\-w\fR] .SH DESCRIPTION .B Dump -examines files on an ext2/3 filesystem and determines which files need to be +examines files on an ext2/3/4 filesystem and determines which files need to be backed up. These files are copied to the given disk, tape or other storage medium for safe keeping (see the .B \-f @@ -95,7 +95,7 @@ option below). A level number above 0, incremental backup, tells .B dump to copy all files new or modified since the last dump of a lower level. The -default level is 9. Historically only levels 0 to 9 were usable in +default level is 0. Historically only levels 0 to 9 were usable in dump, this version is able to understand any integer as a dump level. .TP .BI \-a @@ -301,7 +301,7 @@ is treated as a prefix and .B dump writes in sequence to .I 001, 002 -etc. This can be useful when dumping to files on an ext2 partition, in order to +etc. This can be useful when dumping to files on an ext2/3/4 partition, in order to bypass the 2GB file size limitation. .TP .BI \-n @@ -435,7 +435,7 @@ option causes .B dump to print out, for all file systems in .I __DUMPDATES__ , -and regognized file systems in +and recognized file systems in .I /etc/mtab and .IR /etc/fstab . @@ -521,8 +521,8 @@ Always start with a level 0 backup, for example: This should be done at set intervals, say once a month or once every two months, and on a set of fresh tapes that is saved forever. .IP \(em -After a level 0, dumps of active file systems are taken on a daily basis, using -a modified Tower of Hanoi algorithm, with this sequence of dump levels: +After a level 0, dumps of active file systems are taken on a daily basis, +with this sequence of dump levels: .RS 14 .B 3 2 5 4 7 6 9 8 9 9 ... .RE @@ -535,6 +535,12 @@ set of tapes per dumped file system is used, also on a cyclical basis. After several months or so, the daily and weekly tapes should get rotated out of the dump cycle and fresh tapes brought in. .PP +Another backup strategy is the Tower of Hanoi sequence, which reuses +older tapes in a way that for newer dates the available restore points +are more frequent, then for older dates (see +http://en.wikipedia.org/wiki/Backup_rotation_scheme for additional +information). +.PP (The 4.3BSD option syntax is implemented for backward compatibility but is not documented here.) .SH ENVIRONMENT @@ -599,13 +605,13 @@ correctly with either pre-0.4b34 or 0.4b34 and later versions of .B dump provided that the machine on which .B dump -is run did not change timezones (which should be a fairly rare occurence). +is run did not change timezones (which should be a fairly rare occurrence). .SH EXIT STATUS .B 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 -It might be considered a bug that this version of dump can only handle ext2/3 +It might be considered a bug that this version of dump can only handle ext2/3/4 filesystems. Specifically, it does not work with FAT filesystems. .PP Fewer than 32 read errors (change this with @@ -616,7 +622,7 @@ from dump can be parsed to look for lines that contain the text 'read error'. When a read error occurs, .B dump prints out the corresponding physical disk block and sector number and the -ext2/3 logical block number. It doesn't print out the corresponing file name or +ext2/3/4 logical block number. It doesn't print out the corresponding file name or even the inode number. The user has to use .BR debugfs (8), commands @@ -653,7 +659,7 @@ The backup suite was ported to Linux's Second Extended File System by Remy Card . He maintained the initial versions of .B dump -(up and including 0.4b4, released in january 1997). +(up and including 0.4b4, released in January 1997). .PP Starting with 0.4b5, the new maintainer is Stelian Pop . .SH AVAILABILITY