Or maybe too many coffees..?! :)
Ok - now I understand you loud and clear! Thanks very much!
I'll do more reading because with my new understanding of "Level 1 ==
all changed since the last level 0" things will make much more sense.
Much appreciated!
Thanks.
Johan
-----Original Message-----
From: Paul Bijnens [mailto:Paul.Bijnens AT xplanation DOT com]
Sent: 11 October 2007 11:34
To: Johan Booysen
Cc: amanda List
Subject: Re: RE exclusions
On 2007-10-11 12:03, Johan Booysen wrote:
> When I say differential I mean a backup that contains everything since
> the last full backup. Incremental for me means a backup that contains
> the changed files since the last backup, whether the last one was a
> full backup or not.
>
> If your "incremental level 1" backup is actually the same as my
> "differential backup", then I've completely misunderstood that whole
> issue until now.
Level 0 == full backup
Level 1 == all changed since the last level 0 == differential backup
level 2 == all changed since last level 1 (you are trying to avoid
the levels >= 2, or did I miss something?)
>
> :0|
>
> Ok, so say I want to do 1 full backup each week (Monday - Friday) and
> differentials (everything changed since the last full backup) in
> between, what would you suggest for these in amanda.conf?
>
> bumpsize
> bumpdays
> Bumpmult
bumpdays 99999
is enough. Now Amanda waits about 273 years before considering a level
2 incremental backup.
>
> Or does it not quite work that way?
>
> I don't really understand what bumpdays, bumppercent and bumpmult do
> and/or how they do it. My apologies but I must be dim or something -
> tried to read up before sending this reply this but still lost
> (http://www.amanda.org/docs/amanda.conf.5.html).
A coffee helps, and reading it three times again...
Maybe you miss one point: Amanda first runs an estimate for different
levels of backup. When a level 0 backup is not due, Aanda runs an
estimate for level N (the level that was run the last time), and, if
bumpdays have passed since the last bump in levels, she also runs an
estimate for level N+1. When the estimates are done, Amanda picks a
"good" level.
Settings "bumpdays 99999" accomplished what you need, I believe.
(It is better than "bumppercent 100", which would maybe run an estimate
for level N+1, which will later be decided as not to be "good" -- too
much waste of time + machine load).
>
> Thanks.
>
> -----Original Message-----
> From: owner-amanda-users AT amanda DOT org
> [mailto:owner-amanda-users AT amanda DOT org] On Behalf Of Paul Bijnens
> Sent: 11 October 2007 10:07
> To: Amanda List
> Subject: Re: RE exclusions
>
> On 2007-10-11 10:35, Johan Booysen wrote:
>> Thanks fo your reply.
>>
>> My understanding (as far as that goes) has always been that amanda
>> can
>
>> only do full and incremental backups?
>
> ?? "...only..." ?? What other kind of backup are you hinting at?
> If you mean a "http://www.backup4all.com/differential-backup.php";,
> then that's just an incremental level 1, which you can configure by
> setting e.g. "bumppercent 100", or by setting "bumpdays 99999"
> (the latter one assumes you do run at least one other full backup
> within the next 273 years :-) ).
>
>
>>
>> I've been doing full backups because until now we've had the capacity
>> to do that. If I switch to the way amanda should really work, then
>> does that not mean that I'll get full and incremental backups, which
>> will make the restore process more cumbersome in terms of the number
>> of tapes needed for a restore?
>
> Yes, but not so complicated that a restore becomes an gigantic task.
> Moreover, then chance to need to restore a recently modified file is
> much larger than files that are never changed. And in that case
> restore from an incremental is much faster.
>
> How else would you like to solve the problem of "too much data to fit
> on a tape"? (besides removing the "dead files".)
>
>
>
>>
>> I'm still using amanda 2.4.4.
>>
>> Will appreciate your advice on this.
>>
>> ---------------------------------------------------------------------
>> -
>> --
>> *From:* Cyrille Bollu [mailto:Cyrille.Bollu AT fedasil DOT be]
>> *Sent:* 10 October 2007 16:57
>> *To:* Johan Booysen
>> *Cc:* amanda-users AT amanda DOT org; owner-amanda-users AT amanda DOT org
>> *Subject:* RE exclusions
>>
>>
>> At first sight it looks very easy: You are currently only doing
>> full-daily backups. So, switch to regular incremental/differential
>> backups and you'll be fine (No need to ask people doing tar files...)
>>
>> Also, Amanda has all the features you need to keep track of where
>> your
>
>> files have been backuped. (eg: "index yes" in amanda.conf, amrecover,
>> amtoc,...)
>>
>> >
>> > What I want to do now is continue doing full backups every night,
>> but > exclude any data that will have been backed up to the monthly
>> archive > tape.
>>
>> IMHO, you are describing a differential backup scheme here.
>>
>> Cyrille
>
>
>
--
Paul Bijnens, xplanation Technology Services Tel +32 16 397.511
Technologielaan 21 bus 2, B-3001 Leuven, BELGIUM Fax +32 16 397.512
http://www.xplanation.com/ email: Paul.Bijnens AT xplanation DOT com
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