Veritas-bu

[Veritas-bu] Max Fragment size

2004-02-17 14:59:34
Subject: [Veritas-bu] Max Fragment size
From: bobby.l.walker AT lmco DOT com (Walker, Bobby L)
Date: Tue, 17 Feb 2004 13:59:34 -0600
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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.
 
  _____  

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
 
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 <mailto: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 class=Section1>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>What (if anything) should you set the max
fragment size on UNIX and WINTEL when multiplexing your <span 
class=GramE>backups.</span>
I want to make sure that I don&#8217;t harm the backup performance by playing
with the fragment size.<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<div>

<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>

<hr size=2 width="100%" align=center tabindex=-1>

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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] <b><span 
style='font-weight:
bold'>On Behalf Of </span></b><st1:place w:st="on">Coco</st1:place>, Samuel
(Cont, ARL/CISD)<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, February 17, 2004
11:20 AM<br>
<b><span style='font-weight:bold'>To:</span></b> Donaldson, Mark; Dave Markham;
veritas-bu AT mailman.eng.auburn DOT edu<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Veritas-bu] Max
Fragment size</span></font><o:p></o:p></p>

</div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<div>

<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>We have been using a 2 Gig Fragment for
about 7 to 9 months now and have seen very good 
results.</span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

</div>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thank you,</span></font><o:p></o:p></p>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Samuel J. Coco, STG</span></font><o:p></o:p></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Functional Area Manager, ARL</span></font><o:p></o:p></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Sr UNIX Administrator</span></font><o:p></o:p></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>BELL&nbsp;&nbsp;&nbsp; &nbsp; 301 394-1151 DSN 
290</span></font><o:p></o:p></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>CELL (B) 240 398-7121 / (H)443 
496-1623</span></font><o:p></o:p></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>HOME&nbsp;&nbsp;&nbsp;&nbsp; 410 
604-2415</span></font><o:p></o:p></p>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Email&nbsp; <a href="mailto:scoco AT arl.army DOT mil">scoco 
AT arl.army DOT mil</a></span></font><o:p></o:p></p>

<blockquote style='margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>

<p class=MsoNormal style='margin-bottom:12.0pt'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> Donaldson, Mark
[mailto:Mark.Donaldson AT experianems DOT com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, February 17, 2004
11:54 AM<br>
<b><span style='font-weight:bold'>To:</span></b> 'Dave Markham'; veritas-bu AT 
mailman.eng.auburn DOT edu<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Veritas-bu] Max
Fragment size</span></font><o:p></o:p></p>

<div>

<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Each fragment is separately tracked in the
catalog so having chunks too small makes for larger catalogs.&nbsp; I think
there's some header information on-tape per fragment, too, so backup sizes
might increase a bit.</span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

</div>

<div>

<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Still, I think fragments are a big
improvement to restore times are are well worth it.&nbsp; 2 to 4 Gig seems to
be a common suggested size.</span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

</div>

<div>

<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>-M</span></font><o:p></o:p></p>

</div>

<blockquote style='margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>

<p class=MsoNormal style='margin-bottom:12.0pt'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> Dave Markham
[mailto:dave.markham AT icl DOT net]<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, February 17, 2004
4:50 AM<br>
<b><span style='font-weight:bold'>To:</span></b>
veritas-bu AT mailman.eng.auburn DOT edu<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Veritas-bu] Max Fragment
size</span></font><o:p></o:p></p>

<div>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>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.</span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

</div>

<div>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>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?</span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

</div>

<div>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks</span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

</div>

<div>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Environments:-</span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

</div>

<div>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Netbackup 3.2, Solaris 8 Using SUN L1000 4 DLT 7000 tape
units</span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

</div>

<div>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Netbackup 4.5 FP6 Solaris 8 Using SUN L25 and LTO 
drive</span></font><o:p></o:p></p>

</div>

<div>

<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

</div>

<div>

<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Dave</span></font><o:p></o:p></p>

</div>

</blockquote>

</blockquote>

</div>

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