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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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<TITLE>RE: [Veritas-bu] Fragment Size</TITLE>
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<P><FONT SIZE=3D2>The fragment size setting is used for both tape and disk =
storage units. When using it for a tape storage unit, the system will=
=
=66ragment a large backup into fragments that are no larger than the =
=66ragment size setting. </FONT></P>
<P><FONT SIZE=3D2>The downside of this is that for large backups, the syste=
m=
has to pause each time it writes a fragment and put down a tape mark. =
;=
This causes the backups to be slower.</FONT></P>
<P><FONT SIZE=3D2>The upside of this is when you go to do a small restore =
=66rom 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.</FONT></P>
<P><FONT SIZE=3D2>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.</FONT></P>
<P><FONT SIZE=3D2>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 =
=66or your database servers or other systems with large files.</FONT></P>
<P><FONT SIZE=3D2>Steve White</FONT>
</P>
<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: Michael Suen [<A =
HREF=3D"mailto:suen AT cosmos.buffalo DOT edu">mailto:suen AT cosmos.buffalo
DOT edu</A>]=
</FONT>
<BR><FONT SIZE=3D2>Sent: Wednesday, May 15, 2002 8:53 AM</FONT>
<BR><FONT SIZE=3D2>To: Carlos Perales</FONT>
<BR><FONT SIZE=3D2>Cc: veritas-bu AT mailman.eng.auburn DOT edu</FONT>
<BR><FONT SIZE=3D2>Subject: Re: [Veritas-bu] Fragment Size</FONT>
</P>
<BR>
<P> <FONT SIZE=3D2>Hello =
Carlos</FONT>
</P>
<P> <FONT SIZE=3D2>The Fragemnet =
size has affect if you are planning</FONT>
<BR> <FONT SIZE=3D2>to backup to =
disk storage unit.</FONT>
</P>
<P> <FONT SIZE=3D2>It is the Max =
size of the file it will create to store</FONT>
<BR> <FONT SIZE=3D2>your backup. =
In the "old days" there is a limited of</FONT>
<BR> <FONT SIZE=3D2>a single larg=
e=
file of max 2G. If you lower the</FONT>
<BR> <FONT SIZE=3D2>Frag size to =
like 1G, and your backup is total 5G,</FONT>
<BR> <FONT SIZE=3D2>it will creat=
e=
Five, 1 G files in that specific </FONT>
<BR> <FONT =
SIZE=3D2>directory.</FONT>
</P>
<P> <FONT SIZE=3D2>There is no =
=66rag size for tape storgae unit. (0)</FONT>
<BR> <FONT SIZE=3D2>It doesn't =
matter how big, just store to there.</FONT>
</P>
<P> <FONT SIZE=3D2>And, yes you =
have to change/update your storage unit.</FONT>
</P>
<P> <FONT SIZE=3D2>thx</FONT>
</P>
<P> =
=
<FONT SIZE=3D2>Mike</FONT>
</P>
<P><FONT SIZE=3D2>On Wed, 15 May 2002, Carlos Perales wrote:</FONT>
</P>
<P><FONT SIZE=3D2>> </FONT>
<BR><FONT SIZE=3D2>> </FONT>
<BR><FONT SIZE=3D2>> </FONT>
<BR><FONT SIZE=3D2>> Hi,</FONT>
<BR><FONT SIZE=3D2>> </FONT>
<BR><FONT SIZE=3D2>> I've a question.</FONT>
<BR><FONT SIZE=3D2>> </FONT>
<BR><FONT SIZE=3D2>> How does fragment size affects backups ?</FONT>
<BR><FONT SIZE=3D2>> What are the pros and cons ?</FONT>
<BR><FONT SIZE=3D2>> </FONT>
<BR><FONT SIZE=3D2>> Is there like a "better" fragment size =
setting ?</FONT>
<BR><FONT SIZE=3D2>> </FONT>
<BR><FONT SIZE=3D2>> In case of making this modification, Do I only have=
=
to change the setting to the</FONT>
<BR><FONT SIZE=3D2>> storage unit ?</FONT>
<BR><FONT SIZE=3D2>> </FONT>
<BR><FONT SIZE=3D2>> THanks,</FONT>
<BR><FONT SIZE=3D2>> Carlos</FONT>
<BR><FONT SIZE=3D2>> </FONT>
<BR><FONT SIZE=3D2>> </FONT>
<BR><FONT SIZE=3D2>> </FONT>
<BR><FONT SIZE=3D2>> =
_______________________________________________</FONT>
<BR><FONT SIZE=3D2>> Veritas-bu maillist - =
Veritas-bu AT mailman.eng.auburn DOT edu</FONT>
<BR><FONT SIZE=3D2>> <A =
HREF=3D"http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu"; =
TARGET=3D"_blank">http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu=
</A></FONT>
<BR><FONT SIZE=3D2>> </FONT>
</P>
<BR>
<BR>
<BR>
<P><FONT SIZE=3D2>_______________________________________________</FONT>
<BR><FONT SIZE=3D2>Veritas-bu maillist - =
Veritas-bu AT mailman.eng.auburn DOT edu</FONT>
<BR><FONT SIZE=3D2><A =
HREF=3D"http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu"; =
TARGET=3D"_blank">http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu=
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