Did you have to change your "Keep TIR Information" to longer than 1 day
in your Master server properties to get this to work?

-Jonathan 

-----Original Message-----
From: Jon Bousselot [mailto:jon-bousselot AT pacbell DOT net] 
Sent: Wednesday, February 20, 2008 1:21 PM
To: Martin, Jonathan
Cc: VERITAS-BU AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Question about synthetic backups

The synthetic full keeps track of moved and deleted files that occur
between incrementals.  When the incrementals are assembled, the changes
are reflected in the new synthetic full.  I just tested this to see for
myself. (ver 6.5)

I believe this feature is enabled (and required) in the policy under the
label "collect true image restore information" and "with move
detection".

I moved a subdirectory to a new directory level, and the incremental
backed up the entire contents of that moved data.  It isn't smart enough
to see that the files were same just moved to a new home.  Maybe
de-duplication will handle this in future versions.

-Jon

> You need to run a differential and then a synthetic full immediately 
> following.  The synthetic basically takes your last full and applies 
> all the differentials to it to create a new "full" image.
>
> Full + Diff + Diff + Diff = Synthetic Full Synthetic Full + Diff + 
> Diff + Diff = Synthetic Full Synthetic Full + Diff + Diff + Diff = 
> Synthetic Full etc...
>
> The "Synthetic Full" is a normal full image backup according to 
> Netbackup and gets used in the next Synthetic Backup.  I think there 
> are issues with this related to deleted files (differential backups 
> don't realize that something got deleted so the new full will have all

> the deleted files) so I would recommend "refreshing" the synthetic 
> with an actual full every so often.
>
>
> -Jonathan
>
> -----Original Message-----
> From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of 
> dbergen
> Sent: Tuesday, February 19, 2008 2:20 PM
> To: VERITAS-BU AT mailman.eng.auburn DOT edu
> Subject: [Veritas-bu] Question about synthetic backups
>
>
> When I attempt a synthetic backup and the most recent backup of the 
> client is a full backup nothing happens.
>
> Nothing happens because Netbackup says there was no incremental backup

> to analyze. My question is: So What?
>
> I want another full backup, to a completely different volume pool, 
> shouldn't Netbackup realize that the volume pool is different and run 
> the synthetic backup again?
>
> Hopefully someone can tell me what I am doing wrong here.
>
> Thanks,
> dbergen
>
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