[Veritas-bu] Performance/Buffers

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I've read about tuning the buffers in NB3.4.1 and have been attempting to
reduce the number of waits concerning empty buffers buy increasing the
number of data buffers file. But I still see a considerable number of waits
for full buffers. The way I understand this is that the tape drive is now
the one waiting and can greatly impact performance. But to reduce this wait
one needs to adjust the size of the data buffer. I run at 65536 which is
suppose to be the default for DLT 4000-8000 drives. I was told at a training
class to reduce the size of the data buffers to reduce the number of times
you wait for a full buffer. But in the training material it also states that
one should not go below the default size for the drive. 

Do I accept what I have and just live with it or decrease the size of the
data buffer down to 32K versus 64K.

Wayne D. Cierkowski
Project Engineering Advisor

HarperCollinsPublishers
1000 Keystone Industrial Park
Scranton, PA 18512-4621

* Phone: (570) 941-1387
* Fax: (570) 941-1593
* e-Mail: Mailto:wayne.cierkowski AT harpercollins DOT com





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<P><FONT FACE=3D"Times New Roman">I've read about tuning the buffers in NB3=
.4.1 and have been attempting to reduce the number of waits concerning empt=
y buffers buy increasing the number of data buffers file. But I still see a=
 considerable number of waits for full buffers. The way I understand this i=
s that the tape drive is now the one waiting and can greatly impact perform=
ance. But to reduce this wait one needs to adjust the size of the data buff=
er. I run at 65536 which is suppose to be the default for DLT 4000-8000 dri=
ves. I was told at a training class to reduce the size of the data buffers =
to reduce the number of times you wait for a full buffer. But in the traini=
ng material it also states that one should not go below the default size fo=
r the drive. </FONT></P>

<P><FONT FACE=3D"Times New Roman">Do I accept what I have and just live wit=
h it or decrease the size of the data buffer down to 32K versus 64K.</FONT>
</P>

<P><B><FONT FACE=3D"Comic Sans MS">Wayne D. Cierkowski</FONT></B>
<BR><FONT FACE=3D"Times New Roman">Project Engineering Advisor</FONT>
</P>

<P><FONT COLOR=3D"#FF0000" FACE=3D"Garamond">Harper</FONT><FONT COLOR=3D"#0=
000FF" FACE=3D"Garamond">Collins</FONT><I></I><I><FONT COLOR=3D"#808080" FA=
CE=3D"Stempel">Publishers</FONT></I>
<BR><FONT SIZE=3D1 FACE=3D"Tahoma">1000 Keystone Industrial Park</FONT>
<BR><FONT SIZE=3D1 FACE=3D"Tahoma">Scranton, PA 18512-4621</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Wingdings">(<FONT FACE=3D"Courier New"></FONT></F=
ONT> <FONT SIZE=3D2 FACE=3D"Arial">Phone: (570) 941-1387</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Wingdings">(<FONT FACE=3D"Courier New"></FONT></=
FONT> <FONT SIZE=3D2 FACE=3D"Arial">Fax: (570) 941-1593</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Wingdings">*<FONT FACE=3D"Courier New"></FONT></=
FONT> <FONT SIZE=3D2 FACE=3D"Arial">e-Mail:<U></U></FONT><U></U><U><FONT SI=
ZE=3D2 FACE=3D"Times New Roman"></FONT> <FONT COLOR=3D"#0000FF" SIZE=3D2 FA=
CE=3D"Arial"><A HREF=3D"Mailto:wayne.cierkowski AT harpercollins DOT 
com">Mailto:w=
ayne.cierkowski AT harpercollins DOT com</A></FONT></U><BR>

</P>
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