Veritas-bu

[Veritas-bu] generally speaking

2002-07-31 16:11:24
Subject: [Veritas-bu] generally speaking
From: Mark.Donaldson AT experianems DOT com (Donaldson, Mark)
Date: Wed, 31 Jul 2002 14:11:24 -0600
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When you're "waiting on full buffers" then the tape-writer process is
waiting for data to arrive from the clients.  This means your tape drive is
idle.

It's better to "wait on empty buffers" - this means NB is waiting on your
tape drives to complete writing - making the performance bottleneck at the
drive.  This is probably where you want it to be.

Remember, if your tape drive is waiting on data, then it's stopping and
starting as data arrives and is written.  The mechanical delays can add
significant time to a backup and wear tapes & drives out faster due to
"shoe-shining".

-M

-----Original Message-----
From: Dave Clark [mailto:dclark AT springboardhosting DOT com]
Sent: Wednesday, July 31, 2002 11:02 AM
To: 'veritas-bu AT mailman.eng.auburn DOT edu'
Subject: [Veritas-bu] generally speaking


What's worse.....delays for full or delays for empty buffers?


Thank You,
DClark
Unix Admin

Springboard Managed Hosting
Support: 919 573 0700 option 1
Fax: 919 573 5121
Email: dclark AT springboardhosting DOT com
Support Email: support AT springboardhosting DOT com
http://www.springboardhosting.com

***           Thank you for contacting Springboard Support             ***
*** For complete support please email support AT springboardhosting DOT com    
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_______________________________________________
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<P><FONT SIZE=3D2>When you're &quot;waiting on full buffers&quot; then =
the tape-writer process is waiting for data to arrive from the =
clients.&nbsp; This means your tape drive is idle.</FONT></P>

<P><FONT SIZE=3D2>It's better to &quot;wait on empty buffers&quot; - =
this means NB is waiting on your tape drives to complete writing - =
making the performance bottleneck at the drive.&nbsp; This is probably =
where you want it to be.</FONT></P>

<P><FONT SIZE=3D2>Remember, if your tape drive is waiting on data, then =
it's stopping and starting as data arrives and is written.&nbsp; The =
mechanical delays can add significant time to a backup and wear tapes =
&amp; drives out faster due to &quot;shoe-shining&quot;.</FONT></P>

<P><FONT SIZE=3D2>-M</FONT>
</P>

<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: Dave Clark [<A =
HREF=3D"mailto:dclark AT springboardhosting DOT com">mailto:dclark@springboardh=
osting.com</A>]</FONT>
<BR><FONT SIZE=3D2>Sent: Wednesday, July 31, 2002 11:02 AM</FONT>
<BR><FONT SIZE=3D2>To: 'veritas-bu AT mailman.eng.auburn DOT edu'</FONT>
<BR><FONT SIZE=3D2>Subject: [Veritas-bu] generally speaking</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>What's worse.....delays for full or delays for empty =
buffers?</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Thank You,</FONT>
<BR><FONT SIZE=3D2>DClark</FONT>
<BR><FONT SIZE=3D2>Unix Admin</FONT>
</P>

<P><FONT SIZE=3D2>Springboard Managed Hosting</FONT>
<BR><FONT SIZE=3D2>Support: 919 573 0700 option 1</FONT>
<BR><FONT SIZE=3D2>Fax: 919 573 5121</FONT>
<BR><FONT SIZE=3D2>Email: dclark AT springboardhosting DOT com</FONT>
<BR><FONT SIZE=3D2>Support Email: support AT springboardhosting DOT com</FONT>
<BR><FONT SIZE=3D2><A HREF=3D"http://www.springboardhosting.com"; =
TARGET=3D"_blank">http://www.springboardhosting.com</A></FONT>
</P>

<P><FONT =
SIZE=3D2>***&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 Thank you for contacting Springboard =
Support&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp; ***</FONT>
<BR><FONT SIZE=3D2>*** For complete support please email =
support AT springboardhosting DOT com&nbsp;&nbsp;&nbsp; ***</FONT>
</P>
<BR>
<BR>

<P><FONT =
SIZE=3D2>_______________________________________________</FONT>
<BR><FONT SIZE=3D2>Veritas-bu maillist&nbsp; -&nbsp; =
Veritas-bu AT mailman.eng.auburn DOT edu</FONT>
<BR><FONT SIZE=3D2><A =
HREF=3D"http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu"; =
TARGET=3D"_blank">http://mailman.eng.auburn.edu/mailman/listinfo/veritas=
-bu</A></FONT>
</P>

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