Veritas-bu

[Veritas-bu] 9940B config in a L700

2003-04-30 09:31:54
Subject: [Veritas-bu] 9940B config in a L700
From: trosamond AT uslec DOT com (Rosamond, Travis)
Date: Wed, 30 Apr 2003 09:31:54 -0400
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Okay I ran the DD test and did in fact see speeds of 69M per sec....
=20
It seems to me that NBU is what is slowing the devices down... On Last
nights backups I still did not see much better than my DLT drives =
except for
one of my dev boxes which was 27...
=20
ANY Thoughts on this is needed because it just DOES NOT make sense to =
me...
=20
-Travis

-----Original Message-----
From: Brochart, Fabrice [mailto:BrochF AT europe.stortek DOT com]
Sent: Wednesday, April 30, 2003 5:06 AM
To: Rosamond, Travis
Cc: 'Veritas-Bu (E-mail)'
Subject: RE: [Veritas-bu] 9940B config in a L700


    Travis,
=20
All your drives are direct connect or via fiber switch ??
=20
It seems that all your NetBackup tuning parameters are good so,did you =
try,
as Paul mentioned it, some trivial tests.
=20
Speed disk test with dd command, and tape tests (even with DLT drive).
=20
Fabrice

-----Message d'origine-----
De : Paul Winkeler [mailto:pwinkeler AT pbnj-solutions DOT com]
Envoy=E9 : mardi 29 avril 2003 21:30
=C0 : 'Rosamond, Travis'
Cc : 'Veritas-Bu (E-mail)'
Objet : RE: [Veritas-bu] 9940B config in a L700


Travis
=20
I'll second what the two other gentlemen already mentioned.  Since you =
don't
say anything about restore operations failing I am assuming you already =
had
the SIZE_DATA_BUFFERS set properly.  The number of buffers is still key
though.
=20
Try this experiment on one of your T9940B drives:
    dd if=3D/dev/zero bs=3D1024k count=3D2048 of=3D/dev/rmt/<num>cbn
and use iostat -xn to monitor the write throughput to the drive.  I =
have
seen speeds of up to 69MByte/sec this way.
=20
By the way what class sun machine are running this on?
=20
 PaulW
=20
www.pbnj-solutions.com <http://www.pbnj-solutions.com/>  IT Solutions =
That
Stick
(216) 533-5708


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<DIV><SPAN class=3D701332813-30042003><FONT face=3D"Times New Roman"=20
color=3D#0000ff>Okay I ran the DD test and did in fact see speeds of =
69M per=20
sec....</FONT></SPAN></DIV>
<DIV><SPAN class=3D701332813-30042003><FONT face=3D"Times New Roman"=20
color=3D#0000ff></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D701332813-30042003><FONT face=3D"Times New Roman"=20
color=3D#0000ff>It seems to me that NBU is what is slowing the devices =
down... On=20
Last nights backups I still did not see much better than my DLT drives =
except=20
for one of my dev boxes which was 27...</FONT></SPAN></DIV>
<DIV><SPAN class=3D701332813-30042003><FONT face=3D"Times New Roman"=20
color=3D#0000ff></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D701332813-30042003><FONT face=3D"Times New Roman"=20
color=3D#0000ff>ANY Thoughts on this is needed because it just DOES NOT =
make sense=20
to me...</FONT></SPAN></DIV>
<DIV><SPAN class=3D701332813-30042003><FONT face=3D"Times New Roman"=20
color=3D#0000ff></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D701332813-30042003><FONT face=3D"Times New Roman"=20
color=3D#0000ff>-Travis</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> Brochart, Fabrice =

  [mailto:BrochF AT europe.stortek DOT com]<BR><B>Sent:</B> Wednesday, April =
30, 2003=20
  5:06 AM<BR><B>To:</B> Rosamond, Travis<BR><B>Cc:</B> 'Veritas-Bu=20
  (E-mail)'<BR><B>Subject:</B> RE: [Veritas-bu] 9940B config in a=20
  L700<BR><BR></FONT></DIV>
  <DIV><SPAN class=3D567093908-30042003><FONT =
size=3D2>&nbsp;&nbsp;&nbsp;=20
  Travis,</FONT></SPAN></DIV>
  <DIV><SPAN class=3D567093908-30042003><FONT =
size=3D2></FONT></SPAN>&nbsp;</DIV>
  <DIV><SPAN class=3D567093908-30042003><FONT size=3D2>All your drives =
are direct=20
  connect or via fiber switch ??</FONT></SPAN></DIV>
  <DIV><SPAN class=3D567093908-30042003><FONT =
size=3D2></FONT></SPAN>&nbsp;</DIV>
  <DIV><SPAN class=3D567093908-30042003><FONT size=3D2>It seems that =
all your=20
  NetBackup tuning parameters are good so,did you try, as Paul =
mentioned it,=20
  some trivial tests.</FONT></SPAN></DIV>
  <DIV><SPAN class=3D567093908-30042003><FONT =
size=3D2></FONT></SPAN>&nbsp;</DIV>
  <DIV><SPAN class=3D567093908-30042003><FONT size=3D2>Speed disk test =
with dd=20
  command, and tape tests (even with DLT drive).</FONT></SPAN></DIV>
  <DIV><SPAN class=3D567093908-30042003><FONT =
size=3D2></FONT></SPAN>&nbsp;</DIV>
  <DIV><SPAN class=3D567093908-30042003><FONT =
size=3D2>Fabrice</FONT></SPAN></DIV>
  <BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
    <DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
    size=3D2>-----Message d'origine-----<BR><B>De&nbsp;:</B> Paul =
Winkeler=20
    [mailto:pwinkeler AT pbnj-solutions DOT com]<BR><B>Envoy=E9&nbsp;:</B> =
mardi 29 avril=20
    2003 21:30<BR><B>=C0&nbsp;:</B> 'Rosamond, =
Travis'<BR><B>Cc&nbsp;:</B>=20
    'Veritas-Bu (E-mail)'<BR><B>Objet&nbsp;:</B> RE: [Veritas-bu] 9940B =
config=20
    in a L700<BR><BR></FONT></DIV>
    <DIV><SPAN class=3D937152419-29042003><FONT =
size=3D2>Travis</FONT></SPAN></DIV>
    <DIV><SPAN class=3D937152419-29042003><FONT =
size=3D2></FONT></SPAN>&nbsp;</DIV>
    <DIV><SPAN class=3D937152419-29042003><FONT size=3D2>I'll second =
what the two=20
    other gentlemen already mentioned.&nbsp; Since you don't say =
anything about=20
    restore operations failing I am assuming you already had the <FONT=20
    size=3D2>SIZE_DATA_BUFFERS set properly.&nbsp; The number of =
buffers is still=20
    key though.</FONT></FONT></SPAN></DIV>
    <DIV><SPAN class=3D937152419-29042003><FONT size=3D2></FONT></SPAN>&=
nbsp;</DIV>
    <DIV><SPAN class=3D937152419-29042003><FONT size=3D2>Try this =
experiment on one=20
    of your T9940B drives:</FONT></SPAN></DIV>
    <DIV><SPAN class=3D937152419-29042003>&nbsp;&nbsp;&nbsp;&nbsp;<FONT =
size=3D2>dd=20
    if=3D/dev/zero bs=3D1024k count=3D2048=20
    of=3D/dev/rmt/&lt;num&gt;cbn</FONT></SPAN></DIV>
    <DIV><SPAN class=3D937152419-29042003><FONT size=3D2>and use iostat =
-xn to=20
    monitor the write throughput to the drive.&nbsp; I have seen speeds =
of up to=20
    69MByte/sec this way.</FONT></SPAN></DIV>
    <DIV><SPAN class=3D937152419-29042003><FONT =
size=3D2></FONT></SPAN>&nbsp;</DIV>
    <DIV><SPAN class=3D937152419-29042003><FONT size=3D2>By the way =
what class sun=20
    machine are running this on?</FONT></SPAN></DIV>
    <DIV><SPAN class=3D937152419-29042003><FONT =
size=3D2></FONT></SPAN>&nbsp;</DIV>
    <DIV><SPAN class=3D937152419-29042003><FONT=20
    size=3D2>&nbsp;PaulW</FONT></SPAN></DIV>
    <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
    <DIV align=3Dleft><FONT size=3D2><A=20
    href=3D"http://www.pbnj-solutions.com/";>www.pbnj-solutions.com</A> =
IT=20
    Solutions That Stick</FONT></DIV>
    <DIV align=3Dleft><FONT size=3D2>(216)=20
533-5708</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>

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