Veritas-bu

[Veritas-bu] Fragment size settings

2001-10-17 11:37:17
Subject: [Veritas-bu] Fragment size settings
From: kylea AT firstlogic DOT com (Kyle Adamski)
Date: Wed, 17 Oct 2001 10:37:17 -0500
This message is in MIME format. Since your mail reader does not understand
this format, some or all of this message may not be legible.

------_=_NextPart_001_01C15721.9A66A500
Content-Type: text/plain;
        charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

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.
=20
Hope that helps.
=20
Kyle A. Adamski
kylea AT firstlogic DOT com
608.788.8154 x3093
=20
=20
-----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
=20
        Hi ,=20
I read somewhere that restore is more faster with fragment size (depend =
on
size (depend on backup :) ))=20
And some customers tells me the same things but I've never verified.=20
HTH=20
F@brice=20
-----Message d'origine-----=20
De : Sixbury, Dan [ mailto:sixbury AT celeritas DOT com
<mailto:sixbury AT celeritas DOT com> ]=20
Envoy=E9 : mercredi 17 octobre 2001 16:00=20
=C0 : EBU (E-mail)=20
Objet : [Veritas-bu] Fragment size settings=20
=20
Has anyone seen any benefits for using fragment size on the storage =
units,=20
or have reasons to not use fragment sizes?  I think the default is=20
unlimited, but I noticed that we had some storage units that were set =
to=20
2000 while others had the default of unlimited.=20
Thanks,=20
Dan=20
_______________________________________________=20
Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu=20
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
<http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu> =20

------_=_NextPart_001_01C15721.9A66A500
Content-Type: text/html;
        charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<html xmlns:o=3D"urn:schemas-microsoft-com:office:office" =
xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
xmlns=3D"http://www.w3.org/TR/REC-html40";>

<head>
<META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; =
charset=3Diso-8859-1">


<meta name=3DProgId content=3DWord.Document>
<meta name=3DGenerator content=3D"Microsoft Word 9">
<meta name=3DOriginator content=3D"Microsoft Word 9">
<link rel=3DFile-List href=3D"cid:[email protected]">
<title>RE: [Veritas-bu] Fragment size settings</title>
<!--[if gte mso 9]><xml>
 <o:OfficeDocumentSettings>
  <o:DoNotRelyOnCSS/>
 </o:OfficeDocumentSettings>
</xml><![endif]--><!--[if gte mso 9]><xml>
 <w:WordDocument>
  <w:Zoom>0</w:Zoom>
  <w:DocumentKind>DocumentEmail</w:DocumentKind>
  <w:EnvelopeVis/>
 </w:WordDocument>
</xml><![endif]-->
<style>
<!--
 /* Font Definitions */
@font-face
        {font-family:Tahoma;
        panose-1:2 11 6 4 3 5 4 4 2 4;
        mso-font-charset:0;
        mso-generic-font-family:swiss;
        mso-font-pitch:variable;
        mso-font-signature:553679495 -2147483648 8 0 66047 0;}
 /* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
        {mso-style-parent:"";
        margin:0in;
        margin-bottom:.0001pt;
        mso-pagination:widow-orphan;
        font-size:12.0pt;
        font-family:"Times New Roman";
        mso-fareast-font-family:"Times New Roman";}
a:link, span.MsoHyperlink
        {color:blue;
        text-decoration:underline;
        text-underline:single;}
a:visited, span.MsoHyperlinkFollowed
        {color:blue;
        text-decoration:underline;
        text-underline:single;}
p.MsoAutoSig, li.MsoAutoSig, div.MsoAutoSig
        {margin:0in;
        margin-bottom:.0001pt;
        mso-pagination:widow-orphan;
        font-size:12.0pt;
        font-family:"Times New Roman";
        mso-fareast-font-family:"Times New Roman";}
p
        {margin-right:0in;
        mso-margin-top-alt:auto;
        mso-margin-bottom-alt:auto;
        margin-left:0in;
        mso-pagination:widow-orphan;
        font-size:12.0pt;
        font-family:"Times New Roman";
        mso-fareast-font-family:"Times New Roman";}
span.EmailStyle18
        {mso-style-type:personal-reply;
        mso-ansi-font-size:10.0pt;
        mso-ascii-font-family:Arial;
        mso-hansi-font-family:Arial;
        mso-bidi-font-family:Arial;
        color:navy;}
@page Section1
        {size:8.5in 11.0in;
        margin:1.0in 1.25in 1.0in 1.25in;
        mso-header-margin:.5in;
        mso-footer-margin:.5in;
        mso-paper-source:0;}
div.Section1
        {page:Section1;}
-->
</style>
</head>

<body lang=3DEN-US link=3Dblue vlink=3Dblue =
style=3D'tab-interval:.5in'>

<div class=3DSection1>

<p class=3DMsoNormal><span class=3DEmailStyle18><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>T=
he theory
behind the fragment size setting on the storage unit is to break the =
larger tar
images into smaller fragments.<span style=3D"mso-spacerun: yes">&nbsp;
</span>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.<span
style=3D"mso-spacerun: yes">&nbsp; </span>We use them and have them set =
at 2G&#8230;.I
have never tested the speed of restores with and without them&#8230;.I =
have just
accepted them in principle and assumed that they worked as =
advertised.<span
style=3D"mso-spacerun: yes">&nbsp; </span>If you have them set at =
0(unlimited)
there will be no fragmentation.<o:p></o:p></span></font></span></p>

<p class=3DMsoNormal><span class=3DEmailStyle18><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><=
![if =
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></font></span></p>=


<p class=3DMsoNormal><span class=3DEmailStyle18><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>H=
ope that
helps.<o:p></o:p></span></font></span></p>

<p class=3DMsoNormal><span class=3DEmailStyle18><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><=
![if =
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></font></span></p>=


<p class=3DMsoAutoSig><!--[if supportFields]><span =
class=3DEmailStyle18><font=20
size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial'><span =
style=3D'mso-element:field-begin'></span><span=20
style=3D"mso-spacerun: yes">&nbsp;</span>AUTOTEXTLIST \s &quot;E-mail=20
Signature&quot; <span =
style=3D'mso-element:field-separator'></span></span></font></span><![end=
if]--><font
color=3Dnavy><span style=3D'color:navy'>Kyle A. =
Adamski</span></font><font
color=3Dnavy><span =
style=3D'color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font><=
/p>

<p class=3DMsoAutoSig><font size=3D3 color=3Dnavy face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt;color:navy'>kylea AT firstlogic DOT com</span></font>=
<font
color=3Dnavy><span =
style=3D'color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font><=
/p>

<p class=3DMsoAutoSig><font size=3D3 color=3Dnavy face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt;color:navy'>608.788.8154 =
x3093</span></font><font
color=3Dnavy><span =
style=3D'color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font><=
/p>

<p class=3DMsoAutoSig><font size=3D3 color=3Dnavy face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt;color:navy'><![if =
!supportEmptyParas]>&nbsp;<![endif]></span></font><font
color=3Dnavy><span =
style=3D'color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font><=
/p>

<p class=3DMsoNormal><!--[if supportFields]><span =
class=3DEmailStyle18><font=20
size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial'><span =
style=3D'mso-element:field-end'></span></span></font></span><![endif]-->=
<span
class=3DEmailStyle18><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><![if =
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></font></span></p>=


<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblack
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma;color:black'>-----Original
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> Brochart, Fabrice
[mailto:BrochF AT europe.stortek DOT com]<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Wednesday, October =
17, 2001
9:23 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> 'Sixbury, Dan'; EBU =
(E-mail)<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: =
[Veritas-bu] Fragment
size settings</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'><![if =
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></font></p>

<p style=3D'margin-left:.5in'><font size=3D3 color=3Dblack =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt;color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;
</span></font><font size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;
color:black'>Hi , </span></font><font color=3Dblack><span =
style=3D'color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>

<p style=3D'margin-left:.5in'><font size=3D2 color=3Dblack =
face=3D"Times New Roman"><span
style=3D'font-size:10.0pt;color:black'>I read somewhere that restore is =
more
faster with fragment size (depend on size (depend on backup :) =
))</span></font><font
color=3Dblack><span style=3D'color:black'> </span></font><font =
color=3Dblack><span
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font>=
</p>

<p style=3D'margin-left:.5in'><font size=3D2 color=3Dblack =
face=3D"Times New Roman"><span
style=3D'font-size:10.0pt;color:black'>And some customers tells me the =
same
things but I've never verified.</span></font><font color=3Dblack><span
style=3D'color:black'> </span></font><font color=3Dblack><span =
style=3D'color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>

<p style=3D'margin-left:.5in'><font size=3D2 color=3Dblack =
face=3D"Times New Roman"><span
style=3D'font-size:10.0pt;color:black'>HTH</span></font><font =
color=3Dblack><span
style=3D'color:black'> </span></font><font color=3Dblack><span =
style=3D'color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>

<p style=3D'margin-left:.5in'><font size=3D2 color=3Dblack =
face=3D"Times New Roman"><span
style=3D'font-size:10.0pt;color:black'>F@brice</span></font><font =
color=3Dblack><span
style=3D'color:black'> </span></font><font color=3Dblack><span =
style=3D'color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>

<p style=3D'margin-left:.5in'><font size=3D2 color=3Dblack =
face=3D"Times New Roman"><span
style=3D'font-size:10.0pt;color:black'>-----Message =
d'origine-----</span></font><font
color=3Dblack><span style=3D'color:black'> <br>
</span></font><font size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;
color:black'>De : Sixbury, Dan [<a =
href=3D"mailto:sixbury AT celeritas DOT com">mailto:sixbury AT celeritas DOT 
com</a>]<=
/span></font><font
color=3Dblack><span style=3D'color:black'> <br>
</span></font><font size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;
color:black'>Envoy=E9 : mercredi 17 octobre 2001 =
16:00</span></font><font
color=3Dblack><span style=3D'color:black'> <br>
</span></font><font size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;
color:black'>=C0 : EBU (E-mail)</span></font><font color=3Dblack><span
style=3D'color:black'> <br>
</span></font><font size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;
color:black'>Objet : [Veritas-bu] Fragment size =
settings</span></font><font
color=3Dblack><span style=3D'color:black'> </span></font><font =
color=3Dblack><span
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font>=
</p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3Dblack
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;color:black'><![if =
!supportEmptyParas]>&nbsp;<![endif]></span></font><font
color=3Dblack><span =
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font>=
</p>

<p style=3D'margin-left:.5in'><font size=3D2 color=3Dblack =
face=3D"Times New Roman"><span
style=3D'font-size:10.0pt;color:black'>Has anyone seen any benefits for =
using
fragment size on the storage units,</span></font><font =
color=3Dblack><span
style=3D'color:black'> <br>
</span></font><font size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;
color:black'>or have reasons to not use fragment sizes?&nbsp; I think =
the
default is</span></font><font color=3Dblack><span =
style=3D'color:black'> <br>
</span></font><font size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;
color:black'>unlimited, but I noticed that we had some storage units =
that were
set to</span></font><font color=3Dblack><span style=3D'color:black'> =
<br>
</span></font><font size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;
color:black'>2000 while others had the default of unlimited. =
</span></font><font
color=3Dblack><span =
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font>=
</p>

<p style=3D'margin-left:.5in'><font size=3D2 color=3Dblack =
face=3D"Times New Roman"><span
style=3D'font-size:10.0pt;color:black'>Thanks,</span></font><font =
color=3Dblack><span
style=3D'color:black'> <br>
</span></font><font size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;
color:black'>Dan</span></font><font color=3Dblack><span =
style=3D'color:black'> <br>
</span></font><font size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;
color:black'>_______________________________________________</span></fon=
t><font
color=3Dblack><span style=3D'color:black'> <br>
</span></font><font size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;
color:black'>Veritas-bu maillist&nbsp; -&nbsp;
Veritas-bu AT mailman.eng.auburn DOT edu</span></font><font =
color=3Dblack><span
style=3D'color:black'> <br>
</span></font><font size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;
color:black'><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></span></font><font
color=3Dblack><span style=3D'color:black'> </span></font><font =
color=3Dblack><span
style=3D'color:black;mso-color-alt:windowtext'><o:p></o:p></span></font>=
</p>

</div>

</body>

</html>

------_=_NextPart_001_01C15721.9A66A500--