root wrote:
>
> Can anyone interpret the man page for dump that discusses the use of the
> "modified Tower of Hanoi" algorithm. What is the logic in using that?
Basically you have multiple copies of everything spread over various
tapes, but a minimum of tapes.
In your GFS system, somewhere you have multiple copies of the full
system, maybe on every tape. This costs in tapes and backup time, but
makes for fastest restore as only one tape/set of tapes is involved The
Dump/Hanoi system reduces the amount backed up at the risk of involving
multiple tapes to recover.
To be a little bit long winded, Tower of Hanoi sequence goes something
like,
1,2,1,3,1,2,1,4,1,2,1,3,1,2,1,5,1,2,1,3,1,2... and i'm lost.
The numbers for dump represent LEVELs of backup, with 0=full backup and
9 = partial backup (perhaps someone has a URL to exactly what each level
is).
So the Modified Tower of Hanoi system over time takes less number of
full backups and only picks up changed files, until the sequence
restarts.
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