On 11/1/07, John Drescher <[EMAIL PROTECTED]> wrote:
>
> > For those in Bacula DVD userland who are using DVD+RWs, it strikes me as
> if
> > 1,000 overwrites is really not all that bad. For example, if I have a
> > dedicated DVD+RW disc for incremental backups that I re-use (and blank
> out
> > completely) once every Wednesday (such as in between Full backups run
> once
> > every Sunday), that's about 52 Wednesdays per year (and about 1,000
> > read/write mounts gets me about 19 years). Unless of course one has to
> > conduct numerous restores from the Wednesday DVD+RW disc, how would this
> > "add up quickly"? Do Bacula sys admins who are using DVD+RW media re-use
> the
> > same discs for many days of the week ( e.g., appending incrementals to
> the
> > same disc for, say, an entire week or more)? I might be missing
> something as
> > I'm a bit bleary eyed from too much Bacula DVD testing today.
> >
> I use a lot of DVD+RW and I can say that with DVD players DVD+RW media
> becomes useless in less than 100 passes but this media is still good
> enough for data as long as you read it on the writer that burned it. I
> think the one thing that you are not considering here is that with
> bacula the whole dvd is not written in one pass and so it gets mounted
> a few times during the write operation. I believe this process will
> reduce this 1000 number significantly but I have never tested that.
John, thank you for sharing your experiences. Its a good reminder that 1,000
is probably quite liberal. I wonder if Kern (or whomever maintains the
Bacula User's Guide) would consider revising to incorporate your
experiences?
The good news is that for basic servers where DVD capacities are fine,
DVD+RWs are quite cheap at about $1 USD per disc.
Cheers,
-H
John
>
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