On 2006-06-13 12:10, Toralf Lund wrote:
Yes indeed. The whole DLE. A singe DLE still needs to be written
in one run, possibly using many tapes.
Oh no... Like I said, that's a big disappointment. I'm tempted to say
that it is not correct to claim that Amanda now suppots tape spanning,
if it can't span dumps across tapes written in separate runs.
Shouldn't it be able to delete the corresponding data from the holding
disk file as tape-chunks are successfully written - so that only the
remaining chunks would be flushed on the next run? Seems like this
should be easy enough to implement, especially if you interact with
holding disk chunks in a constructive manner. Is there any reason why
nobody has looked into this, except for lack of time?
... or maybe what's on the holding disk does not really matter and/or is
a separate issue. I suppose the taper already knows how to find a
certain tape-chunk within the holding disk data, so it's more a matter
of being able to tell it to start writing from a certain chunk
(different from 0) during flush. The flush operation would obviously
have to find the correct index somewhere in the database. Does it do a
lookup at all today, or just blindly tape whatever is on the holding disk?
Taping one DLE is several "runs" opens a can of worms: you have to
add a notion of "partial" succeeded. Restoring then needs some tapes
and some holdingdisk files. What if the holdingdisk crashes or
accidently rm the files before all of it is written to tape? etc.
As Stefan used to say: AAPW(*).
(*) http://article.gmane.org/gmane.comp.archivers.amanda.user/25064
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Paul Bijnens, xplanation Technology Services Tel +32 16 397.511
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