The Tower of Hanoi example wasn't.

[dump.git] / dump / dump.8.in

diff --git a/dump/dump.8.in b/dump/dump.8.in
index 400eff20a493cc13be74367a24b576bffd34129e..ce6198cc434c86c9edabd92eb972b59c84125c6c 100644 (file)
--- a/dump/dump.8.in
+++ b/dump/dump.8.in
@@ -26,7 +26,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
 .\" 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 1.60 2008/09/04 19:21:07 stelian Exp $

 .\"
 .TH DUMP 8 "version __VERSION__ of __DATE__" BSD "System management commands"
 .SH NAME
 .\"
 .TH DUMP 8 "version __VERSION__ of __DATE__" BSD "System management commands"
 .SH NAME


@@ -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
 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
 .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
 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
 (The 4.3BSD option syntax is implemented for backward compatibility but is not
 documented here.)
 .SH ENVIRONMENT