Thanks Steve..
        
        Cool... Learning something interesting..

        thx

                Mike

On Wed, 15 May 2002, White, Steve wrote:

> The fragment size setting is used for both tape and disk storage units.
> When using it for a tape storage unit, the system will fragment a large
> backup into fragments that are no larger than the fragment size setting. 
> 
> The downside of this is that for large backups, the system has to pause each
> time it writes a fragment and put down a tape mark.  This causes the backups
> to be slower.
> 
> The upside of this is when you go to do a small restore from a large backup,
> the system will scan to the fragment that contains the file you want and
> then has to read through the fragment to locate the specific file.  If you
> fragment size is unlimited, this can take a lot longer to restore a single
> file than if your fragment size is set lower.
> 
> So you want to balance the fragment setting to a reasonable number that
> won't slow down your backups too much yet allows restores to proceed at a
> reasonable rate.
> 
> You may want to consider having lower fragment sizes for things where you
> have a high likelihood of requiring a single file restore (such as the
> backups of your file servers) and have a larger fragment size for your
> database servers or other systems with large files.
> 
> Steve White
> 
> -----Original Message-----
> From: Michael Suen [mailto:suen AT cosmos.buffalo DOT edu]
> Sent: Wednesday, May 15, 2002 8:53 AM
> To: Carlos Perales
> Cc: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: Re: [Veritas-bu] Fragment Size
> 
> 
>       Hello Carlos
> 
>       The Fragemnet size has affect if you are planning
>       to backup to disk storage unit.
> 
>       It is the Max size of the file it will create to store
>       your backup. In the "old days" there is a limited of
>       a single large file of max 2G. If you lower the
>       Frag size to like 1G, and your backup is total 5G,
>       it will create Five, 1 G files in that specific 
>       directory.
> 
>       There is no frag size for tape storgae unit. (0)
>       It doesn't matter how big, just store to there.
> 
>       And, yes you have to change/update your storage unit.
> 
>       thx
> 
>                       Mike
> 
> On Wed, 15 May 2002, Carlos Perales wrote:
> 
> > 
> > 
> > 
> > Hi,
> > 
> > I've a question.
> > 
> > How does fragment size affects backups ?
> > What are the pros and cons ?
> > 
> > Is there like a "better" fragment size setting ?
> > 
> > In case of making this modification, Do I only have to change the setting
> to the
> > storage unit ?
> > 
> > THanks,
> > Carlos
> > 
> > 
> > 
> > _______________________________________________
> > Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> > 
> 
> 
> 
> 
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> 
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