On Tue, Jan 23, 2007 at 01:16:34AM -0600, Frank Smith wrote:
> Yogesh Hasabnis wrote:
> > --- Frank Smith <fsmith AT hoovers DOT com> wrote:
> >
> >> Yogesh Hasabnis wrote:
> >>> Hi All,
> >>>
> >>> As per the AMANDA faqs, "AMANDA spreads full
> >> backups
> >>> along the dumpcycle, so you wont' have any
> >> full-only
> >>> or incremental-only runs."
> >>>
> >>> What I understand from this is that if you have
> >>> multiple filesystems on multiple hosts to be
> >> backed up
> >>> in an AMANDA dumpcycle, AMANDA will take care of
> >>> spreading the full backups of different
> >>> areas/filesystems on different days so that it is
> >> not
> >>> overloaded on weekends for doing the full backups
> >>> (Correct me if I am wrong). However in my case, I
> >> have
> >>> only one area or one filesystem on one host to be
> >>> backed up. Data created by all users which needs
> >> to be
> >>> backed up is stored by them under one directory on
> >> a
> >>> central file server, which will be backed up by
> >>> AMANDA. Now in this case, how will AMANDA spread
> >> the
> >>> full and the incremental backup load (because it
> >> has
> >>> only one area to be backed up in the whole
> >> dumpcycle)?
> >>
> >> Yes, if you have only one DLE Amanda obviously can't
> >> spread
> >> its full dump over several days. You could use tar
> >> instead
> >> of dump, and make each subdirectory a separate DLE,
> >> then the
> >> fulls could be spread out.
> >
> > Thanks for the reply. So if I only have one DLE, will
> > the full backup always take place on a particular day
> > and will only incremental backups be taken on the
> > remaining days? Or will it be handled in some
> > different way?
>
> dumpcycle is just the maximum time between fulls. Amanda
> often schedules them sooner if it thinks it will level out
> daily tape usage. I don't know how it handles a single
> DLE, as that is not really what it was designed for.
> If you really want it to always be the same day, you
> might be able to force it with a maxpromoteday setting,
> but it may be easier to just use two configs, an always-full
> one that runs on the prefered day, and an incremental-only
> one that runs on the other days.
>
I'm nearly certain that an amadmin "force" will override
the increment only setting. Given that, you could have
a single config that does increment only and a cronjob
that once a week does the amadmin force to generate
the full dump on the day desired.
The main problem with such schemes is the lack of a
full dump if the system was down when it was desired.
Normal amanda scheduling would realize one was missed
and automatically schedule the full dump on a
"non-standard" day of the week.
--
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)
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