> -----Messaggio originale-----
> Da: owner-amanda-users AT amanda DOT org
> [mailto:owner-amanda-users AT amanda DOT org] Per conto di Jon LaBadie
> Inviato: martedì 8 novembre 2005 16.24
> A: amanda-users AT amanda DOT org
> Oggetto: Re: R: 2 tapes backup...
>
>
> On Tue, Nov 08, 2005 at 02:54:20PM +0100, Montagni, Giovanni wrote:
> >>
> >> -----Messaggio originale-----
> >> Da: owner-amanda-users AT amanda DOT org
> >> [mailto:owner-amanda-users AT amanda DOT org] Per conto di Gene Heskett
> >> Inviato: martedì 8 novembre 2005 14.23
> >> A: amanda-users AT amanda DOT org
> >> Oggetto: Re: 2 tapes backup...
> >>
> >>
> >> On Tuesday 08 November 2005 03:11, Montagni, Giovanni wrote:
> >> >My backup have to use 2 different tapes to do full dumps.
> >> >I read the amanda's docs, but i can't understand how can i tell to
> >> >amanda to use 2 tapes without tape changer (i use an lto
> drive so i
> >> >have to change tape manually at the morning when i arrive
> to work, tha
> >> >backup start late at night). I tried with chg-manual, but i can't
> >> >switch tape when it is ran by cron.
> >>
> >> Why not? The change tape message should be waiting for you in the
> >> morning, and when you've changed the tape, amanda should
> be able to
> >> resume, having completed the backup to the holding disk in the
> >> meantime. So all it needs to do is flush the remainder.
> Or, maybe
> >> you have to issue the amflush command when you've changed
> the tape in
> >> the morning. I'm not 100% sure, never having used chg-manual
> >> personally.
> >>
> >> You need enough holding disk for that of course.
> >> Not having enough holding disk seriously limits amanda's abilities.
> >>
> > I don't use the holding disk, because i don't have enough free space
> >> to store data twice (the data itself and backup).
> >
>
> The holding disk only stores untaped data. Not all the data
> will be on the holding disk at the same time. And if you are
> using software compression the dumped data will be smaller
> than the original. While it would be nice to have sufficient
> free space as your total data, the holding disk need not be
> that large.
>
> From a cost perspective, your lto drive cost multi-thousand
> dollars if I read the market correctly. And tapes cost $30
> or more each. It would be only a few percentage points of
> your total backup investment to add an inexpensive disk and
> dedicate it to holding disk space.
>
I know it very well, but i can't buy anything. It's another person who decides
what to buy... What can i do is ask to him.
> The benefits would be improved total time of backup due to
> parallelism of multiple, simultaneous dumps and completion of
> the dump before you arrive the next morning. As it stands
> now, only one DLE (Disk List
> Entry) can dump at a time. And, even with a second tape, the
> dump will continue the next morning while people are working.
>
> However, you don't need a holding disk to use chg-manual.
> But there is little to go on from your description of your
> attempts. What changes did you make to amanda.conf to "try
> with" chg-manual? Was runtapes one of them? What was your
> observation that it did not work? Did you read the comments
> in chg-manual? Hint, always a good idea with script as they
> may point out some parameters the need to be set. As I
> recall, by default chg-manual will notify you on your
> terminal to change the tape. If this is run from cron there
> will be no terminal. But there is, in the script, a way of
> changing from terminal messages to email messages.
I had thought that chg-manual script was provided "as is", so there no way to
redirect the notify.
Looking into it as you suggest i found that i can change many parameters, as
the number of slot, the notify...
>
> With a holding disk, the next morning when you change the
> tape, amanda would just dump the untaped archives to the
> second tape. But without the HD, amanda will resume its
> dumping, compressing, indexing, network traffic, and taping.
> All during business hours. In addition to the impact that may
> make on your users, it also means amanda is backing up file
> systems while they are actively in use and possibly changing.
> Never a good idea.
>
I run to buy a holding disk!
> No, you don't need a holding disk, but get one!
>
> jl
> --
> 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)
>
Thanks a lot to your help. I understand many many things...
Giovanni
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