Jerry McAllister wrote:
But, I wonder why you chose level 9 for your change dumps. It sort
of defeats the system. It would be more normal to use level 1.
I know that [some much] earlier versions of BSD dump only took levels
up to 5, but I presume that since they include up to 9 in the documentation
it should work.
If you only use one level other than 0, then it makes no difference what
that level is: 1, 9, 5 anything but 0. A level N dumps everything since
the last dump < N, which in this case is always the last level 0.
Using "modified tower of hanoi" (so the man page says :-)) can decrease
the amount of data per dump at the cost of having to do more dumps: e.g.
I do 0: 1 3 2 1 3 2 ... 0 ... But if I have to restore everything and
the last dump was a 2, I have to restore the 0 1 and 2. Similarly if it
crashed after 3, I would do 0 1 3. That cuts down the amount of data
dumped, but is slightly more complex than just having to restore the 0
and last 9 (in the OPs case). I could use 1 7 9, or 4 6 8 instead of 1
2 3 and the data dumped would be the same in each case.
I was pretty sure that BSD 4.2 had 9 incremental dump levels, but that
was long, long ago in a universe of 1600bi tapes far, far away :-)
--Alex
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