Re: [Veritas-bu] Question about synthetic backups
2008-02-20 12:41:04
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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