[Veritas-bu] Fragment size settings
2001-10-17 14:48:46
Subject: |
[Veritas-bu] Fragment size settings |
From: |
rob AT worman DOT org (Rob Worman) |
Date: |
Wed, 17 Oct 2001 13:48:46 -0500 |
Are you saying that a Solaris version that doesn't support largefiles
(ignoring the fact that that vintage of Solaris is no longer supported
by NBU > 3.2...) would not be able to extract files from a tape that
contains a 10 GB tar file? I can't disprove this fact, but I can doubt
it. ;-)
rob
Zufall, Ken wrote:
>Fragmentation shouldn't be a problem. Not sure about NBU, but other
>applications I've worked with won't cut a file in the middle of a fragment,
>it will continue to end of current file. So, if you've already backed up
>1.5GB and the next file is .7MB, your fragment size will be 2.2GB. Not
>using fragmentation will cause problems however, because some systems
>(Solaris 2.5 for sure, think they finally fixed in 2.7?) won't allow file
>sizes over 2GB in size. So a 10GB tar file would be unmanageable in this
>instance.
>
>Ken Zufall
>Work: 330.202.4113
>Cell: 330.465.8113
>Pager: 888.896.3272
>E-page: 4403037243.8963272 AT pagenet DOT net
><mailto:4403037243.8963272 AT pagenet DOT net>
>
> -----Original Message-----
> From: Rob Worman [mailto:rworman AT yahoo DOT com]
> Sent: Wednesday, October 17, 2001 11:56 AM
> To: EBU (E-mail)
> Subject: Re: [Veritas-bu] Fragment size settings
>
> and I know of one price you pay for the use of fragment
>size:
> complication of a "non-NBU" tape restore, i.e. reading from
>a NetBackup
> tape using only tar.
>
> Without fragmentation, a single 10GB backup image = a single
>10GB tar
> file. But with a fragment size of 2000, that 10GB backup
>image is now 5
> separate tar files.
>
> Unlike the use of multiplexing, fragmenting is not
>necessarily a
> "showstopper" when considering this aspect of NetBackup's DR
>
> capabilities, but if you really want to be prepared for
>tar-only
> NetBackup restores, you MUST understand the effect
>fragmentation has on
> your media contents. (and you'd be smart to write a script
>to automate
> all the tar commands...)
>
> HTH
> rob
>
>
> Kyle Adamski wrote:
>
> > The theory behind the fragment size setting on the storage
>unit is to
> > break the larger tar images into smaller fragments. This
>allows
> > restores to speed up because in between the fragments is a
>tape mark
> > (identifying what is on the fragment) that will allow NBU
>to scan the
> > tape faster for what it is looking for vs reading the
>entire image. We
> > use them and have them set at 2G....I have never tested
>the speed of
> > restores with and without them....I have just accepted
>them in
> > principle and assumed that they worked as advertised. If
>you have them
> > set at 0(unlimited) there will be no fragmentation.
> >
> > Hope that helps.
> >
> > Kyle A. Adamski
> >
> > kylea AT firstlogic DOT com
> >
> > 608.788.8154 x3093
> >
> > -----Original Message-----
> > From: Brochart, Fabrice [mailto:BrochF AT europe.stortek DOT
> com]
> > Sent: Wednesday, October 17, 2001 9:23 AM
> > To: 'Sixbury, Dan'; EBU (E-mail)
> > Subject: RE: [Veritas-bu] Fragment size settings
> >
> > Hi ,
> >
> > I read somewhere that restore is more faster with fragment
>size
> > (depend on size (depend on backup :) ))
> >
> > And some customers tells me the same things but I've never
>verified.
> >
> > HTH
> >
> > F@brice
> >
> > -----Message d'origine-----
> > De : Sixbury, Dan [mailto:sixbury AT celeritas DOT com ]
> > Envoyé : mercredi 17 octobre 2001 16:00
> > À : EBU (E-mail)
> > Objet : [Veritas-bu] Fragment size settings
> >
> > Has anyone seen any benefits for using fragment size on
>the storage units,
> > or have reasons to not use fragment sizes? I think the
>default is
> > unlimited, but I noticed that we had some storage units
>that were set to
> > 2000 while others had the default of unlimited.
> >
> > Thanks,
> > Dan
> > _______________________________________________
> > Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
> > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> >
>
>
>
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- [Veritas-bu] Fragment size settings, Sixbury, Dan
- [Veritas-bu] Fragment size settings, Brochart, Fabrice
- [Veritas-bu] Fragment size settings, Kyle Adamski
- [Veritas-bu] Fragment size settings, Zufall, Ken
- [Veritas-bu] Fragment size settings,
Rob Worman <=
- [Veritas-bu] Fragment size settings, Zufall, Ken
- [Veritas-bu] Fragment size settings, Cornely, David
- [Veritas-bu] Fragment size settings, Jim Horalek
- [Veritas-bu] Fragment size settings, Marelas, Peter
- [Veritas-bu] Fragment size settings, Marelas, Peter
- [Veritas-bu] Fragment size settings, Jim Horalek
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