Hello
Debra S Baddorf --> amanda-users (2020-04-25 17:11:23 +0000):
> IMHO, you should have a least one multiple of “dumpcycle” in number of tapes
> “tapecycle”. IE minimum dumpcycle=2 if you only have 4 tapes.
> Maybe even dumpcycle=1 if you are limited to 4 tapes. That’s the only
> way to prevent writing over your only level-0.
> I use dumpcycle=7 (a week) but I keep 10 times that many tapes, 70,
> so that I have ten weeks of data being stored.
>
> And, if you want to run more than one backup per day, having a large multiple
> of tapes is even more important.
Sure, I would (and do) use different settings for a production
environment, too. I was just trying to point out that the [1]"Basic
Configuration" from the [2]"Getting Started with Amanda" pages seems not
to work.
However, in the meantime it turned out that if amdump is run only once a
day instead of every few seconds/minutes as I did during my testing,
then a full backup is created after dumpcycle (3) runs at the lastest,
as documented in amanda.conf(5) ("Each disk will get a full backup at
least this often"):
$ amadmin MyConfig find
date host disk lv storage pool tape or file file
part status
2020-04-26 23:05:01 localhost /etc 0 MyConfig MyConfig MyData01 1
1/1 OK
2020-04-27 23:05:01 localhost /etc 1 MyConfig MyConfig MyData02 1
1/1 OK
2020-04-28 23:05:01 localhost /etc 1 MyConfig MyConfig MyData03 1
1/1 OK
2020-04-29 23:05:01 localhost /etc 0 MyConfig MyConfig MyData04 1
1/1 OK
So the issue I described seems to be an issue of my testing, not of how
Amanda works. (It would be nice if Amanda would _never overwrite a full
dump which is needed for restoring, but that's another story...).
> Dumpcycle DOES default to unit=days, but I think you can specify
> otherwise.
> If you want to run 4 backups per day, you might be able to specify
> dumpcycle=6 hours
> but I’m not at all certain about that.
This seems not to work:
$ amcheck MyConfig
'/etc/amanda/MyConfig/amanda.conf', line 14: end of line is expected
ERROR: errors processing config file
> If you are only running extra backups during testing, then make sure to
> FORCE
> an extra level 0 sometime before you hit your tape limit.
> AMADMIN <CONFIG> FORCE DLE-NAME
True, thanks for the hint.
> (Use lower case; my computer keeps trying to correct the spelling, unless I
> use
> uppercase)
Maybe you should ask your computer to be less picky. I mean, you only
have lowercase and uppercase, so if your computer one day starts doing
funny things also when you type uppercase, you'll be run out of options
already.
;)
Cheers, Jukka
[1] https://wiki.zmanda.com/index.php/GSWA/Build_a_Basic_Configuration
[2] https://wiki.zmanda.com/index.php/Getting_Started_with_Amanda
> > On Apr 25, 2020, at 5:55 AM, Jukka Salmi <j+ama...@salmi.ch> wrote:
> >
> > Hello
> >
> > I just installed Amanda 3.5.1 on a Debian 10.3 (buster) system and am
> > following the [1]"GSWA/Build a Basic Configuration" example.
> >
> > $ amgetconf MyConfig tapecycle
> > 4
> > $ amgetconf MyConfig dumpcycle
> > 3
> >
> > Running amdump a few times seemed to be successful, but the I noticed
> > that while the first run created a full backup...
> >
> > $ amadmin MyConfig find
> >
> > date host disk lv storage pool tape or file file
> > part status
> > 2020-04-25 10:41:40 localhost /etc 0 MyConfig MyConfig MyData01 1
> > 1/1 OK
> >
> > ...all subsequent runs created incremental backups...
> >
> > $ amadmin MyConfig find
> >
> > date host disk lv storage pool tape or file file
> > part status
> > 2020-04-25 10:41:40 localhost /etc 0 MyConfig MyConfig MyData01 1
> > 1/1 OK
> > 2020-04-25 10:46:06 localhost /etc 1 MyConfig MyConfig MyData02 1
> > 1/1 OK
> > 2020-04-25 10:46:13 localhost /etc 1 MyConfig MyConfig MyData03 1
> > 1/1 OK
> > 2020-04-25 10:46:21 localhost /etc 1 MyConfig MyConfig MyData04 1
> > 1/1 OK
> >
> > ...and the fifth run overwrote the first vtape which contained the full
> > backup...
> >
> > $ amadmin MyConfig find
> >
> > date host disk lv storage pool tape or file file
> > part status
> > 2020-04-25 10:46:06 localhost /etc 1 MyConfig MyConfig MyData02 1
> > 1/1 OK
> > 2020-04-25 10:46:13 localhost /etc 1 MyConfig MyConfig MyData03 1
> > 1/1 OK
> > 2020-04-25 10:46:21 localhost /etc 1 MyConfig MyConfig MyData04 1
> > 1/1 OK
> > 2020-04-25 10:47:33 localhost /etc 1 MyConfig MyConfig MyData01 1
> > 1/1 OK
> >
> > ...thus rendering the whole backup useless.
> >
> > What am I missing? Is the dumpcycle (3 _days_ in this case) to be taken
> > literally, i.e. should I just not run amdump more often than once _per
> > day_ (per Amanda config)? And if so, how can I configure Amanda not to
> > overwrite a tape containing a full backup which is needed for the other
> > incremental backups, no matter how often it is run in what period?
> >
> >
> > TIA & cheers, Jukka
> >
> > [1]
> > https://urldefense.proofpoint.com/v2/url?u=https-3A__wiki.zmanda.com_index.php_GSWA_Build-5Fa-5FBasic-5FConfiguration&d=DwIBAg&c=gRgGjJ3BkIsb5y6s49QqsA&r=HMrKaRiCv4jddln9fLPIOw&m=YWhNpDiVNBGAkjvVaNwXUETYT-bzQVA-4PYl06QDPaM&s=jy1VinwfaPAm_MGS5vWT5m0PgFAcCi5-_sQB4Sip1Y4&e=
> >
> >
> > --
> > This email fills a much-needed gap in the archives.
>
>
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