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By the way the 900KB/s was only with FlashBackup on a filesystem with
millions of files.
Our regular clients max out at 12MB/s with directly attached or gigabit
at 30-55MB/s.
=20
________________________________
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Paul
Keating
Sent: Friday, August 12, 2005 8:15 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] Question Regarding Positioning Under NetBackup
5.1MP3a.
=20
You'll get those messages on pretty much any backup, as it has to find
the next blank space on the tape to start writing....though I believe it
occurs more on MPX backup, and more again with smaller fragment size.
=20
My understanding is that a bigger fragment size will speed up backups,
because NBU doesn't have to write the fragment info as often, but will
hit you on restores, as once Netbackup has found the correct fragment to
restore from, it has to search through the entire fragment to find the
specific data, so the bigger the fragment, the more data it has to
search through to find the file you want.
=20
However, if you're really getting throughput of 900KB/s, and on a
flashbackup besides, as you said the other day, then I think you've got
some more serious problems to troubleshoot before you need to get into
tuning fragment size.
=20
Paul
-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Piszcz,
Justin
Sent: August 12, 2005 8:06 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Question Regarding Positioning Under
NetBackup 5.1MP3a.
Often when I back any machine up I see the following:
=20
08/12/2005 08:03:00 - positioning L12345 to file 116
08/12/2005 08:03:00 - positioning L12345 to file 118
08/12/2005 08:03:00 - positioning L12345 to file 119
=20
Does this have to do with the fact I am using multiplexing or
does it have to do with the fragment size being set to 2048MB?
=20
Would one get better performance if the fragment size was set to
a different number?
=20
How would it affect backups? (time-wise)
How would it affect restores? (time-wise)
=20
Thanks,
=20
Justin.
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<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>By the way the 900KB/s was only =
with
FlashBackup on a filesystem with millions of =
files.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Our regular clients max out at =
12MB/s with
directly attached or gigabit at 30-55MB/s.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>
<hr size=3D2 width=3D"100%" align=3Dcenter tabindex=3D-1>
</span></font></div>
<p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font =
size=3D2
face=3DTahoma><span style=3D'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=3D'font-weight:bold'>On Behalf Of </span></b>Paul =
Keating<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Friday, August 12, =
2005 8:15
AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b>
veritas-bu AT mailman.eng.auburn DOT edu<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: [Veritas-bu] =
Question
Regarding Positioning Under NetBackup =
5.1MP3a.</span></font><o:p></o:p></p>
</div>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dmaroon face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:maroon'>You'll get those messages on =
pretty much
any backup, as it has to find the next blank space on the tape to start
writing....though I believe it occurs more on MPX backup, and more
again with smaller fragment size.</span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dmaroon face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:maroon'>My understanding is that a bigger
fragment size will speed up backups, because NBU doesn't have to write =
the
fragment info as often, but will hit you on restores, as once Netbackup =
has
found the correct fragment to restore from, it has to search =
through the entire fragment
to find the specific data, so the bigger the fragment, the =
more data
it has to search through to find the file you =
want.</span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dmaroon face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:maroon'>However, if you're really getting
throughput of 900KB/s, and on a flashbackup besides, as you said the =
other day,
then I think you've got some more serious problems to troubleshoot =
before
you need to get into tuning fragment size.</span></font><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=3DMsoNormal><font size=3D2 color=3Dmaroon face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:maroon'>Paul</span></font><o:p></o:p></p>
</div>
<blockquote style=3D'border:none;border-left:solid maroon =
1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'=
>
<p class=3DMsoNormal style=3D'margin-bottom:12.0pt'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original =
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b>
veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] <b><span =
style=3D'font-weight:
bold'>On Behalf Of </span></b>Piszcz, Justin<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> August 12, 2005 =
8:06 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b>
veritas-bu AT mailman.eng.auburn DOT edu<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> [Veritas-bu] =
Question
Regarding Positioning Under NetBackup =
5.1MP3a.</span></font><o:p></o:p></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Often when I back any machine up I see the =
following:<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>08/12/2005 08:03:00 – positioning L12345 to =
file 116<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>08/12/2005 08:03:00 – positioning L12345 to =
file 118<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>08/12/2005 08:03:00 – positioning L12345 to =
file 119<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Does this have to do with the fact I am using =
multiplexing
or does it have to do with the fragment size being set to =
2048MB?<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Would one get better performance if the fragment size =
was
set to a different number?<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>How would it affect backups? =
(time-wise)<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>How would it affect restores? =
(time-wise)<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Thanks,<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Justin.<o:p></o:p></span></font></p>
</blockquote>
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