[Veritas-bu] Fragment size settings
2001-10-17 15:12:07
I've run into this problem before using Alexandria. Format was cpio,
fragment size was 2.5GB or thereabout on Solaris 2.5. When trying to
extract single files from the fragment I was unable to because of the size.
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 2:49 PM
To: Zufall, Ken
Cc: EBU (E-mail)
Subject: Re: [Veritas-bu] Fragment size settings
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,
Zufall, Ken <=
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- [Veritas-bu] Fragment size settings, Marelas, Peter
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