On Thu, Oct 23, 2003 at 05:37:02PM +0200, Toralf Lund wrote:
>
> >>>runspercycle does not need to be changed. The "runtapes" means that
> >>>for each run up to that number of tapes may be used (note: not "must").
> >>>
> >>>
> >>>You have to increase your tapecycle probably to cover the same
> >>>dumpcycle(s), because you'll burn twice as much tapes for each run.
> >>>(well, "burn", hopefully not litteraly).
> >>>
> >>>
> >>I'm still not sure I understand. If I have
> >>
> >>runspercycle 2
> >>
> >>and
> >>
> >>runtapes 2
> >>
> >>will amanda try to distribute the full dumps across 4 tapes, or just 2?
> >>
> >>When I think about it, the first answer makes most sense, as the
> >>parameter otherwise ought to have been called "tapespercycle".
> >>
> >>
> >
> >"Sense" is a funny thing.
> >
> >Amanda will "try" to fit each run on a single tape. But will use a
> >second tape during that run if necessary.
> >
> Ah, I see. So it won't actually multiply tape size by runtapes when
> trying to figure out how much it can write... I'm not sure the
> functionaltiy is of much use to me then, but perhaps I could cheat and
> pretend the tapes are "runtapes" times larger than they really are?
>
Won't buy you anything. Amanda will reach the actual end of the tape
and not be able to go on to a second tape because runtapes is 1.
> > Thus the answer is "it depends".
> >It will try to use 2 tapes, but may use 3 or 4.
> >
> >BTW I find it strange that an "archival" configuration would be setup with
> >a dumpcycle > 0 (or 1?) and with runspercycle > 1.
> >
> >When I want an archive dump I want it to be the state of the system now.
> >Not the current state of half the DLE's and incrementals from the last
> >'archive' of the other half. Maybe that is just me ;)
> >
> >
> The archival config disables incrementals, obsiously. And *of course* I
> have to split the backup across several tapes; isn't the data in any
> real setup larger than what fits on a tape?
Total data, yes. Data per DLE, no. Because amanda can not deal with
individual DLE's larger than a single tape capacity. But it will happily
put 10 DLE's on the first tape, 20 on the second and 4 on the third if
that is what fits, is needed, and runtapes is >= 3.
>
> But actually, one of the reasons why I'm asking about runtapes > 1 is
> that I've considered setting up so that everything is dumped in one run...
Assuming that each individual DLE, when given a level 0, fits on a single
tape, then set dumpcycle = 0, runspercycle = 1, and runtapes = 1000.
--
Jon H. LaBadie jon AT jgcomp DOT com
JG Computing
4455 Province Line Road (609) 252-0159
Princeton, NJ 08540-4322 (609) 683-7220 (fax)
|
