[Veritas-bu] Max Fragment size

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We have been using a 2 Gig Fragment for about 7 to 9 months now and have
seen very good results.
 
 
Thank you,
 
 
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] 
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.
 
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.
 
-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.
 
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?
 
Thanks
 
Environments:-
 
Netbackup 3.2, Solaris 8 Using SUN L1000 4 DLT 7000 tape units
 
Netbackup 4.5 FP6 Solaris 8 Using SUN L25 and LTO drive
 
Dave


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<DIV><SPAN class=3D907431917-17022004><FONT face=3DArial color=3D#0000ff =
size=3D2>We=20
have been using a 2 Gig Fragment for about 7 to 9 months now and have =
seen very=20
good results.</FONT></SPAN></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2>Thank you,</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV align=3Dleft>&nbsp;</DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2>Samuel J. Coco, =
STG</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2>Functional Area Manager,=20
ARL</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2>Sr UNIX =
Administrator</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2>BELL&nbsp;&nbsp;&nbsp; =
&nbsp; 301=20
394-1151 DSN 290</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2>CELL (B) 240 398-7121 / =
(H)443=20
496-1623</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial =
size=3D2>HOME&nbsp;&nbsp;&nbsp;&nbsp; 410=20
604-2415</FONT></DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2>Email&nbsp; <A=20
href=3D"mailto:scoco AT arl.army DOT mil">scoco AT arl.army DOT 
mil</A></FONT></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> =
Donaldson, Mark=20
  [mailto:Mark.Donaldson AT experianems DOT com] <BR><B>Sent:</B> Tuesday, =
February 17,=20
  2004 11:54 AM<BR><B>To:</B> 'Dave Markham';=20
  veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B> RE: [Veritas-bu] =
Max=20
  Fragment size<BR><BR></FONT></DIV>
  <DIV><SPAN class=3D311195216-17022004><FONT face=3DArial =
color=3D#0000ff size=3D2>Each=20
  fragment is separately tracked in the catalog so having chunks too =
small makes=20
  for larger catalogs.&nbsp; I think there's some header information =
on-tape per=20
  fragment, too, so backup sizes might increase a =
bit.</FONT></SPAN></DIV>
  <DIV><SPAN class=3D311195216-17022004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2></FONT></SPAN>&nbsp;</DIV>
  <DIV><SPAN class=3D311195216-17022004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2>Still, I think fragments are a big improvement to restore =
times are are=20
  well worth it.&nbsp; 2 to 4 Gig seems to be a common suggested=20
  size.</FONT></SPAN></DIV>
  <DIV><SPAN class=3D311195216-17022004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2></FONT></SPAN>&nbsp;</DIV>
  <DIV><SPAN class=3D311195216-17022004><FONT face=3DArial =
color=3D#0000ff=20
  size=3D2>-M</FONT></SPAN></DIV>
  <BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
    <DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
    size=3D2>-----Original Message-----<BR><B>From:</B> Dave Markham=20
    [mailto:dave.markham AT icl DOT net]<BR><B>Sent:</B> Tuesday, February 17, =
2004=20
    4:50 AM<BR><B>To:</B> =
veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B>=20
    [Veritas-bu] Max Fragment size<BR><BR></FONT></DIV>
    <DIV><FONT face=3DArial size=3D2>I have seen in a few docs about =
setting this=20
    max fragment size to say 2 gig or anything less than the max file =
size your=20
    OS can handle. How I understand it is that this will then improve =
restore=20
    times as it can skip along these 2 gig chunks until it finds the =
section it=20
    needs and then begin a read through of that chunk to find the files =
needed=20
    and start restore.</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT face=3DArial size=3D2>My question is 1. Am I right in my =
thinking?=20
    and 2. What would be the downside to this? If it improves restore =
times what=20
    reason is there to not set it?</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT face=3DArial size=3D2>Thanks</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT face=3DArial size=3D2>Environments:-</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT face=3DArial size=3D2>Netbackup 3.2, Solaris 8 Using SUN =
L1000 4 DLT=20
    7000 tape units</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT face=3DArial size=3D2>Netbackup 4.5 FP6 Solaris 8 Using =
SUN L25 and=20
    LTO drive</FONT></DIV>
    <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT face=3DArial=20
size=3D2>Dave</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>

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