Veritas-bu

[Veritas-bu] Max Fragment size

2004-02-17 15:58:34
Subject: [Veritas-bu] Max Fragment size
From: Mark.Eisenhardt AT hughessupply DOT com (Mark Eisenhardt)
Date: Tue, 17 Feb 2004 15:58:34 -0500
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For our environment the fragment size has been at 5 Gig for 2 years.
DR testing returned great full system restore times as well as
individual file and filesystem restores.
=20
The development servers are the only ones using multiplexing and their
restore times have always been adequate.
=20
Thanks,
Mark Eisenhardt
        -----Original Message-----
        From: Walker, Bobby L [mailto:bobby.l.walker AT lmco DOT com]=20
        Sent: Tuesday, February 17, 2004 3:00 PM
        To: veritas-bu AT mailman.eng.auburn DOT edu
        Subject: RE: [Veritas-bu] Max Fragment size
=09
=09
        What (if anything) should you set the max fragment size on UNIX
and WINTEL when multiplexing your backups. I want to make sure that I
don't harm the backup performance by playing with the fragment size.
        =20
=09
  _____ =20

        From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Coco,
Samuel (Cont, ARL/CISD)
        Sent: Tuesday, February 17, 2004 11:20 AM
        To: Donaldson, Mark; Dave Markham;
veritas-bu AT mailman.eng.auburn DOT edu
        Subject: RE: [Veritas-bu] Max Fragment size
        =20
        We have been using a 2 Gig Fragment for about 7 to 9 months now
and have seen very good results.
        =20
        =20
        Thank you,
        =20
        =20
        Samuel J. Coco, STG
        Functional Area Manager, ARL
        Sr UNIX Administrator
        BELL      301 394-1151 DSN 290
        CELL (B) 240 398-7121 / (H)443 496-1623
        HOME     410 604-2415
        Email  scoco AT arl.army DOT mil
                -----Original Message-----
                From: Donaldson, Mark
[mailto:Mark.Donaldson AT experianems DOT com]=20
                Sent: Tuesday, February 17, 2004 11:54 AM
                To: 'Dave Markham'; veritas-bu AT mailman.eng.auburn DOT edu
                Subject: RE: [Veritas-bu] Max Fragment size
                Each fragment is separately tracked in the catalog so
having chunks too small makes for larger catalogs.  I think there's some
header information on-tape per fragment, too, so backup sizes might
increase a bit.
                =20
                Still, I think fragments are a big improvement to
restore times are are well worth it.  2 to 4 Gig seems to be a common
suggested size.
                =20
                -M
                        -----Original Message-----
                        From: Dave Markham [mailto:dave.markham AT icl DOT net]
                        Sent: Tuesday, February 17, 2004 4:50 AM
                        To: veritas-bu AT mailman.eng.auburn DOT edu
                        Subject: [Veritas-bu] Max Fragment size
                        I have seen in a few docs about setting this max
fragment size to say 2 gig or anything less than the max file size your
OS can handle. How I understand it is that this will then improve
restore times as it can skip along these 2 gig chunks until it finds the
section it needs and then begin a read through of that chunk to find the
files needed and start restore.
                        =20
                        My question is 1. Am I right in my thinking? and
2. What would be the downside to this? If it improves restore times what
reason is there to not set it?
                        =20
                        Thanks
                        =20
                        Environments:-
                        =20
                        Netbackup 3.2, Solaris 8 Using SUN L1000 4 DLT
7000 tape units
                        =20
                        Netbackup 4.5 FP6 Solaris 8 Using SUN L25 and
LTO drive
                        =20
                        Dave

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<DIV><SPAN class=3D127245120-17022004><FONT face=3DArial color=3D#0000ff =
size=3D2>For=20
our environment the fragment size has been at 5 Gig for 2=20
years.</FONT></SPAN></DIV>
<DIV><SPAN class=3D127245120-17022004><FONT face=3DArial color=3D#0000ff =
size=3D2>DR=20
testing returned great full system restore times as well as individual =
file and=20
filesystem restores.</FONT></SPAN></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2></FONT>&nbsp;</DIV>
<DIV><SPAN class=3D127245120-17022004><FONT face=3DArial color=3D#0000ff =
size=3D2>The=20
development servers are the only ones using multiplexing and their =
restore times=20
have always been adequate.</FONT></SPAN></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2></FONT>&nbsp;</DIV>
<DIV><SPAN class=3D127245120-17022004><FONT face=3DArial color=3D#0000ff =

size=3D2>Thanks,</FONT></SPAN></DIV>
<DIV align=3Dleft><STRONG><EM><FONT face=3D"MS Sans Serif" =
color=3D#000080 size=3D2>Mark=20
Eisenhardt</FONT></EM></STRONG></DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
  <DIV></DIV>
  <DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr =
align=3Dleft><FONT=20
  face=3DTahoma size=3D2>-----Original Message-----<BR><B>From:</B> =
Walker, Bobby L=20
  [mailto:bobby.l.walker AT lmco DOT com] <BR><B>Sent:</B> Tuesday, February =
17, 2004=20
  3:00 PM<BR><B>To:</B> =
veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B> RE:=20
  [Veritas-bu] Max Fragment size<BR><BR></FONT></DIV>
  <DIV class=3DSection1>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">What (if =
anything)=20
  should you set the max fragment size on UNIX and WINTEL when =
multiplexing your=20
  <SPAN class=3DGramE>backups.</SPAN> I want to make sure that I =
don&#8217;t harm the=20
  backup performance by playing with the fragment=20
  size.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <DIV>
  <DIV class=3DMsoNormal style=3D"TEXT-ALIGN: center" =
align=3Dcenter><FONT=20
  face=3D"Times New Roman" size=3D3><SPAN style=3D"FONT-SIZE: 12pt">
  <HR tabIndex=3D-1 align=3Dcenter width=3D"100%" SIZE=3D2>
  </SPAN></FONT></DIV>
  <P class=3DMsoNormal><B><FONT face=3DTahoma size=3D2><SPAN=20
  style=3D"FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: =
Tahoma">From:</SPAN></FONT></B><FONT=20
  face=3DTahoma size=3D2><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Tahoma">=20
  veritas-bu-admin AT mailman.eng.auburn DOT edu=20
  [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] <B><SPAN=20
  style=3D"FONT-WEIGHT: bold">On Behalf Of </SPAN></B><st1:place=20
  w:st=3D"on">Coco</st1:place>, Samuel (Cont, ARL/CISD)<BR><B><SPAN=20
  style=3D"FONT-WEIGHT: bold">Sent:</SPAN></B> Tuesday, February 17, =
2004 11:20=20
  AM<BR><B><SPAN style=3D"FONT-WEIGHT: bold">To:</SPAN></B> Donaldson, =
Mark; Dave=20
  Markham; veritas-bu AT mailman.eng.auburn DOT edu<BR><B><SPAN=20
  style=3D"FONT-WEIGHT: bold">Subject:</SPAN></B> RE: [Veritas-bu] Max =
Fragment=20
  size</SPAN></FONT><o:p></o:p></P></DIV>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <DIV>
  <P class=3DMsoNormal><FONT face=3DArial color=3Dblue size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">We have =
been using a=20
  2 Gig Fragment for about 7 to 9 months now and have seen very good=20
  results.</SPAN></FONT><o:p></o:p></P></DIV>
  <DIV>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt">&nbsp;<o:p></o:p></SPAN></FONT></P></DIV>
  <DIV>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt">&nbsp;<o:p></o:p></SPAN></FONT></P></DIV>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Thank=20
  you,</SPAN></FONT><o:p></o:p></P>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt">&nbsp;<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt">&nbsp;<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Samuel J. Coco,=20
  STG</SPAN></FONT><o:p></o:p></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Functional Area Manager, =

  ARL</SPAN></FONT><o:p></o:p></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Sr UNIX=20
  Administrator</SPAN></FONT><o:p></o:p></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">BELL&nbsp;&nbsp;&nbsp; =
&nbsp; 301=20
  394-1151 DSN 290</SPAN></FONT><o:p></o:p></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">CELL (B) 240 398-7121 / =
(H)443=20
  496-1623</SPAN></FONT><o:p></o:p></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">HOME&nbsp;&nbsp;&nbsp;&nbsp; 410=20
  604-2415</SPAN></FONT><o:p></o:p></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Email&nbsp; <A=20
  =
href=3D"mailto:scoco AT arl.army DOT mil">scoco AT arl.army DOT 
mil</A></SPAN></FONT><o=
:p></o:p></P>
  <BLOCKQUOTE style=3D"MARGIN-TOP: 5pt; MARGIN-BOTTOM: 5pt; =
MARGIN-RIGHT: 0in">
    <P class=3DMsoNormal style=3D"MARGIN-BOTTOM: 12pt"><FONT =
face=3DTahoma=20
    size=3D2><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Tahoma">-----Original=20
    Message-----<BR><B><SPAN style=3D"FONT-WEIGHT: =
bold">From:</SPAN></B>=20
    Donaldson, Mark [mailto:Mark.Donaldson AT experianems DOT com] <BR><B><SPAN 
=

    style=3D"FONT-WEIGHT: bold">Sent:</SPAN></B> Tuesday, February 17, =
2004 11:54=20
    AM<BR><B><SPAN style=3D"FONT-WEIGHT: bold">To:</SPAN></B> 'Dave =
Markham';=20
    veritas-bu AT mailman.eng.auburn DOT edu<BR><B><SPAN=20
    style=3D"FONT-WEIGHT: bold">Subject:</SPAN></B> RE: [Veritas-bu] Max =
Fragment=20
    size</SPAN></FONT><o:p></o:p></P>
    <DIV>
    <P class=3DMsoNormal><FONT face=3DArial color=3Dblue size=3D2><SPAN=20
    style=3D"FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Each =
fragment is=20
    separately tracked in the catalog so having chunks too small makes =
for=20
    larger catalogs.&nbsp; I think there's some header information =
on-tape per=20
    fragment, too, so backup sizes might increase a=20
    bit.</SPAN></FONT><o:p></o:p></P></DIV>
    <DIV>
    <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
    style=3D"FONT-SIZE: 12pt">&nbsp;<o:p></o:p></SPAN></FONT></P></DIV>
    <DIV>
    <P class=3DMsoNormal><FONT face=3DArial color=3Dblue size=3D2><SPAN=20
    style=3D"FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Still, I =
think=20
    fragments are a big improvement to restore times are are well worth=20
    it.&nbsp; 2 to 4 Gig seems to be a common suggested=20
    size.</SPAN></FONT><o:p></o:p></P></DIV>
    <DIV>
    <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
    style=3D"FONT-SIZE: 12pt">&nbsp;<o:p></o:p></SPAN></FONT></P></DIV>
    <DIV>
    <P class=3DMsoNormal><FONT face=3DArial color=3Dblue size=3D2><SPAN=20
    style=3D"FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: =
Arial">-M</SPAN></FONT><o:p></o:p></P></DIV>
    <BLOCKQUOTE=20
      style=3D"MARGIN-TOP: 5pt; MARGIN-BOTTOM: 5pt; MARGIN-RIGHT: =
0in"><P=20
      class=3DMsoNormal style=3D"MARGIN-BOTTOM: 12pt"><FONT =
face=3DTahoma size=3D2><SPAN=20
      style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">-----Original=20
      Message-----<BR><B><SPAN style=3D"FONT-WEIGHT: =
bold">From:</SPAN></B> Dave=20
      Markham [mailto:dave.markham AT icl DOT net]<BR><B><SPAN=20
      style=3D"FONT-WEIGHT: bold">Sent:</SPAN></B> Tuesday, February 17, =
2004 4:50=20
      AM<BR><B><SPAN style=3D"FONT-WEIGHT: bold">To:</SPAN></B>=20
      veritas-bu AT mailman.eng.auburn DOT edu<BR><B><SPAN=20
      style=3D"FONT-WEIGHT: bold">Subject:</SPAN></B> [Veritas-bu] Max =
Fragment=20
      size</SPAN></FONT><o:p></o:p></P>
      <DIV>
      <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
      style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">I have seen in a few =
docs=20
      about setting this max fragment size to say 2 gig or anything less =
than=20
      the max file size your OS can handle. How I understand it is that =
this=20
      will then improve restore times as it can skip along these 2 gig =
chunks=20
      until it finds the section it needs and then begin a read through =
of that=20
      chunk to find the files needed and start=20
      restore.</SPAN></FONT><o:p></o:p></P></DIV>
      <DIV>
      <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN =

      style=3D"FONT-SIZE: =
12pt">&nbsp;<o:p></o:p></SPAN></FONT></P></DIV>
      <DIV>
      <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
      style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">My question is 1. Am =
I right=20
      in my thinking? and 2. What would be the downside to this? If it =
improves=20
      restore times what reason is there to not set=20
      it?</SPAN></FONT><o:p></o:p></P></DIV>
      <DIV>
      <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN =

      style=3D"FONT-SIZE: =
12pt">&nbsp;<o:p></o:p></SPAN></FONT></P></DIV>
      <DIV>
      <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
      style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">Thanks</SPAN></FONT><o:p></o:p></P></DIV>
      <DIV>
      <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN =

      style=3D"FONT-SIZE: =
12pt">&nbsp;<o:p></o:p></SPAN></FONT></P></DIV>
      <DIV>
      <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
      style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">Environments:-</SPAN></FONT><o:p></o:p></P></DIV>
      <DIV>
      <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN =

      style=3D"FONT-SIZE: =
12pt">&nbsp;<o:p></o:p></SPAN></FONT></P></DIV>
      <DIV>
      <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
      style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Netbackup 3.2, =
Solaris 8 Using=20
      SUN L1000 4 DLT 7000 tape units</SPAN></FONT><o:p></o:p></P></DIV>
      <DIV>
      <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN =

      style=3D"FONT-SIZE: =
12pt">&nbsp;<o:p></o:p></SPAN></FONT></P></DIV>
      <DIV>
      <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
      style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Netbackup 4.5 FP6 =
Solaris 8=20
      Using SUN L25 and LTO drive</SPAN></FONT><o:p></o:p></P></DIV>
      <DIV>
      <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN =

      style=3D"FONT-SIZE: =
12pt">&nbsp;<o:p></o:p></SPAN></FONT></P></DIV>
      <DIV>
      <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
      style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
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