Veritas-bu

[Veritas-bu] Fronting backups with disk then bleeding off to tape.

2006-06-20 12:47:17
Subject: [Veritas-bu] Fronting backups with disk then bleeding off to tape.
From: jpiszcz.backup at gmail.com (Justin Piszcz)
Date: Tue, 20 Jun 2006 12:47:17 -0400
Nice, the only part I worry about is what if it cannot bleed off to
tape fast enough and the disk fills up? Has this happened to you?

On 6/20/06, Paul Keating <pkeating at bank-banque-canada.ca> wrote:
> Yes, common in many environments.
> Yes, you can use multiple streams from a DSSU to tape....works quite
> well in practice.
> 6 is supposed to work better than 5, in that you can group DSSUs, like
> regular STUs, so if one fills up, backups go to another with available
> space.
>
> When you destage to tape from disk, the data is supposed to stay on disk
> untill free space is required....Netbackup attempts to keep the DSSU as
> full as possible, so that data can be restored from disk rather than
> tape. The data is only purged from disk when another backup tries to
> write to the disk and determines the disk is full...then several of the
> oldest images on disk, that have already been destaged to tape, will be
> purged from disk to make room for the new backup.
>
> Paul
>
> --
>
>
> > -----Original Message-----
> > From: veritas-bu-bounces at mailman.eng.auburn.edu
> > [mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf
> > Of Justin Piszcz
> > Sent: June 20, 2006 12:06 PM
> > To: veritas-bu at mailman.eng.auburn.edu
> > Subject: [Veritas-bu] Fronting backups with disk then
> > bleeding off to tape.
> >
> >
> > Does anyone do this with a massive amount of data?  Also, I
> > noticed with
> > 5.1MP4 its possible to use multiple streams to bleed from
> > disk->tape but I
> > was wondering how well this worked practice.
> >
> > How many people bleed off to tape using 5.1MPx?
> > Using 6.0?
> >
> > How well does it work under 6 vs. 5? I know there is a
> > watermark feature.
> > Also, how come when I bled data off to tape under 5.1MP4, it did not
> > remove the images from disk?  Must I manually purge that data?
> >
> > Thanks,
> >
> > Justin.
> > _______________________________________________
> > Veritas-bu maillist  -  Veritas-bu at mailman.eng.auburn.edu
> > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> >
>
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