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[Veritas-bu] General guidelines for Multiplex settings
2003-04-18 16:11:12
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My approach is usually as follows:
Monitor the speed of the backups as they are running to the tape drive.
Once the sum of the speeds of the parallel jobs its the rated speed of =
the
tape drive (accounting for a compression factor of about 2 to be
conservative) you have optimized the "multiplexing to keep the drive =
busy"
goal.
Admittedly it is a bit tricky to know which jobs are writing to the same
tape drive at the same time, but it can be done in real-time by =
combining
information from bpdbjobs (tells you which jobs are running and what =
volumes
they are using) and vmoprcmd (tells you which volumes are in which =
drives).
=20
One of the sample programs provided with the NBU Perl modules (see
http://search.cpan.org/author/DUTCHMAN/) called "nbutop.pl" does just =
this.
=20
Let me know if you'd like to pursue this approach,
PaulW
-----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 Turner, =
Eric
Sent: Friday, April 18, 2003 3:31 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] General guidelines for Multiplex settings
Probably a topic that's been discussed many times before.=20
Anyone have some general guidelines for initial settings of the =
multiplexing
attribute within the schedule window of the class?
I have inherited the system and the majority of the classes are set =
across
the board with 7 (fulls and incrementals), and the max setting of the
storage unit properties is at 10.
Backups are completed very well and well within the window , but restore
times are atrocious for any restores that require a significatnt amount =
of
data. Any suggestions for modifications? I have a feeling these =
current
settings are way off.....
NBU 3.4.1_1 Master/Media=20
W2K SP3=20
STK L700=20
10 Seagate LTO drives=20
5 San media servers=20
Thanks!!=20
ERIC=20
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<DIV><SPAN class=3D283320520-18042003><FONT face=3DArial color=3D#0000ff =
size=3D2>My=20
approach is usually as follows:</FONT></SPAN></DIV>
<DIV><SPAN class=3D283320520-18042003><FONT face=3DArial color=3D#0000ff =
size=3D2>Monitor the speed of the backups as they are running to the =
tape=20
drive. Once the sum of the speeds of the parallel jobs its the =
rated speed=20
of the tape drive (accounting for a compression factor of about 2 to be=20
conservative) you have optimized the "multiplexing to keep the drive =
busy"=20
goal.</FONT></SPAN></DIV>
<DIV><SPAN class=3D283320520-18042003><FONT face=3DArial color=3D#0000ff =
size=3D2>Admittedly it is a bit tricky to know which jobs are writing to =
the same=20
tape drive at the same time, but it can be done in real-time by =
combining=20
information from bpdbjobs (tells you which jobs are running and what =
volumes=20
they are using) and vmoprcmd (tells you which volumes are in which=20
drives).</FONT></SPAN></DIV>
<DIV><SPAN class=3D283320520-18042003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D283320520-18042003><FONT face=3DArial color=3D#0000ff =
size=3D2>One of=20
the sample programs provided with the NBU Perl modules (see <A=20
href=3D"http://search.cpan.org/author/DUTCHMAN/";>http://search.cpan.org/a=
uthor/DUTCHMAN/</A>)=20
called "nbutop.pl" does just this.</FONT></SPAN></DIV>
<DIV><SPAN class=3D283320520-18042003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D283320520-18042003><FONT face=3DArial color=3D#0000ff =
size=3D2>Let me=20
know if you'd like to pursue this approach,</FONT></SPAN></DIV>
<DIV><SPAN class=3D283320520-18042003><FONT face=3DArial color=3D#0000ff =
size=3D2> PaulW</FONT></SPAN></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>=20
veritas-bu-admin AT mailman.eng.auburn DOT edu=20
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] <B>On Behalf Of =
</B>Turner,=20
Eric<BR><B>Sent:</B> Friday, April 18, 2003 3:31 PM<BR><B>To:</B>=20
veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B> [Veritas-bu] =
General=20
guidelines for Multiplex settings<BR><BR></FONT></DIV><!-- Converted =
from text/rtf format -->
<P><FONT face=3D"Microsoft Sans Serif" size=3D2>Probably a topic =
that's been=20
discussed many times before.</FONT> </P>
<P><FONT face=3D"Microsoft Sans Serif" size=3D2>Anyone have some =
general=20
guidelines for initial settings of the multiplexing attribute within =
the=20
schedule window of the class?</FONT></P>
<P><FONT face=3D"Microsoft Sans Serif" size=3D2>I have inherited the =
system and=20
the majority of the classes are set across the board with 7 (fulls and =
incrementals), and the max setting of the storage unit properties is =
at=20
10.</FONT></P>
<P><FONT face=3D"Microsoft Sans Serif" size=3D2>Backups are completed =
very well=20
and well within the window , but restore times are atrocious for any =
restores=20
that require a significatnt amount of data. Any =
suggestions for=20
modifications? I have a feeling these current settings are =
way=20
off.....</FONT></P>
<P><FONT face=3D"Microsoft Sans Serif" size=3D2>NBU 3.4.1_1 =
Master/Media</FONT>=20
<BR><FONT face=3D"Microsoft Sans Serif" size=3D2>W2K SP3</FONT> =
<BR><FONT=20
face=3D"Microsoft Sans Serif" size=3D2>STK L700</FONT> <BR><FONT=20
face=3D"Microsoft Sans Serif" size=3D2>10 Seagate LTO drives</FONT> =
<BR><FONT=20
face=3D"Microsoft Sans Serif" size=3D2>5 San media servers</FONT> </P>
<P><FONT face=3D"Microsoft Sans Serif" size=3D2>Thanks!!</FONT> </P>
<P><FONT face=3D"Microsoft Sans Serif" size=3D2>ERIC</FONT>=20
</P></BLOCKQUOTE></BODY></HTML>
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