On 2005-08-01, Phil Stracchino wrote:
> >
> > To "enforce" the policy I set Maximum Volume Job to 2 (Backup plus
> > catalog) and Accept Any Volume to no.
>
> Hm. I don't see how having "Accept Any Volume" disabled would do
> anything to enforce that policy that could not be better enforced by
> carefully structuring you Volume Retention and Volume Use Duration settings.
>
The rotation/recycle and the schedule mechanism of bacula is heavily
based on fixed time intervals. This presupposes that backups take place
at regular points in time. While this is OK at most sites, we have to
deal with the following problems:
1. We life in a part of Germany where there are (fourtunately ? ;-)) a
lot of holidays.
2. It's a small site and we have a lot of customer visitations outside.
So not everyday there is someone in the office who can change tapes.
For this two cases (holidays and nobody in the office) we don't make a
backup. This is not so bad, because apart from some incoming mails there
is not much to backup on these days anyway.
The days on which no backup can take place are known in advance. So I
can make a backup plan with exceptions. On the last workday of a month a
monthly backup is made. On the last workday of the week a weekly backup
is made, otherwise a daily backup.
When I have a daily pool with
---
Volume Use Duration = 12h
Volume Retention = 6d
Recycle = yes
Recycle Oldest Volume = yes
Accept Any Volume = yes
---
then after a holiday week (no backup), all tapes are accepted and not
only the tape with the oldest data. So it can happen, that the tape on
which bacula has written last time before holiday gets overwritten after
holiday.
To be independent from fixed time interval, I have the following
settings:
---
Maximum Volume Jobs = 2
Purge Oldest Volume = yes
Accept Any Volume = no
---
I know, "Purge Oldest Volume = yes" is not the savest setting, but as
long as only one backup per day takes place, this should not be a
problem.
--
Georg
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