On 3/3/2010 8:37 AM, Mike Bydalek wrote:
> I hate bring this up again, but after taking advice from Les and John,
> I'm not seeing what I think I should be seeing. After changing my
> current config to the one below, I started to have incr, incr, full,
> incr, incr, full, but the full's were doing the entire 600G.
>
> Here's what I have for my Host Schedule:
> XferMethod: rsync
> FullPeriod: 1.97
> FullKeepCnt: 12
> FullAgeMax: 13.5
> IncrPeriod: 0.49
> IncrKeepCnt: 28
> IncrLevels: 1,2,3,4
>
> What was odd was the 0 full backup wouldn't go away, even after 20
> days, so I decided to just completely wipe the pool and start over.
Fulls aren't deleted as long as any subsequent incremental depends on
them or if they are needed to meet the FullKeepCnt or FullKeepCntMin values.
> Here's the last few backup numbers:
>
> Type Level Files Duration
> full 0 1006837 2535
> incr 1 1618 69
>
> The system is currently backing up and has been since 3/2 16:00, so
> it's doing another full. This is telling me that the entire server is
> backed up on every full.
It reads all the files on fulls. This may take a long time for large
filesystems.
> If I move this offsite, it's going to
> re-transfer the entire system over, which is what I *can't* have as
> it'll take way too long to backup this much data.
It should only be transmitting the differences.
> Am I missing something here or doing something wrong? I would have
> thought that the diffs between the last increment and the current
> backup would be "merged" somehow to create the latest full.
No, the comparison is against the last full, so the differences copied
during incrementals are copied again in the subsequent full.
> I'm running version 3.2.0beta1 as well. Thanks for any assistance!
The directory structure is read and transmitted in full before the
comparison starts, so if you have a very large number of files you may
need a large amount of RAM to keep this from going to swap and becoming
very slow. If there are logical subdirectory boundaries you could break
the filesystem into separate runs. You can take that a step further by
setting up what appear to be different hosts using the ClientAlias
setting to point them back to the same target - then you can set up
different schedules for the runs and skew the fulls.
--
Les Mikesell
lesmikesell AT gmail DOT com
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