[Veritas-bu] 2 tape drives issue

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(resend snipped for length)

I don't know why smaller buffers would speed restores.  You didn't restore
the full set, though, so it's hard to compare the two values.  I'd do all
speed testing with the most identical sets possible.

The bptm log file is /usr/openv/netbackup/logs/bptm/log.XXXXXX where
"XXXXXX" is a datestamp.  If you don't have the bptm directory under the
"logs" directory, you've implicitly turned off logging for the bptm daemon.


You have to create this (and other) directories to have full logging.  See
the "Debug logs" section of the troubleshooting guide for a list of the
possible directories.

-M

-----Original Message-----
From: Feroz F. Basir [mailto:dbase77 AT yahoo DOT com]
Sent: Friday, March 14, 2003 1:03 PM
To: Donaldson, Mark
Cc: Veritasbu (E-mail)
Subject: RE: [Veritas-bu] 2 tape drives issue


Hi,

This is weird. I changed buffer size to default 32k
and no. of buffer to 8. And I run my restore again.
This time it only took about 30 minutes to restore 35
Gb data. That is half of the actual total size of 70
GB. Tell me something, how buffer size can affect the
restore? I mean increase it good for backup but very
bad for restore. Small value  in buffer size is very
good for restore. I am very confuse here. 

Here is my setting:

buffer size 256K, num of buffer 16. Give backup time
to 38 minutes for 74 GB oracle data. Restore half of
the size (35 GB) give me 3 hrs.

buffer size 32K, num of buffer 8. Give backup time 5
hrs. Restore half of the size (35 GB) give me 30
minutes only.

I hope somebody can explain the reason behind this. I
mean what is the best setting I can use in my
scenario.

Another thing is, bptm log. where about is this log
file? can you give me the actual log file name. i
tried to search whole system, no luck at all. am i
missing something here or what?

Thank you again.

regards,
feroz 

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<P><FONT SIZE=3D2>(resend snipped for length)</FONT>
</P>

<P><FONT SIZE=3D2>I don't know why smaller buffers would speed =
restores.&nbsp; You didn't restore the full set, though, so it's hard =
to compare the two values.&nbsp; I'd do all speed testing with the most =
identical sets possible.</FONT></P>

<P><FONT SIZE=3D2>The bptm log file is =
/usr/openv/netbackup/logs/bptm/log.XXXXXX where &quot;XXXXXX&quot; is a =
datestamp.&nbsp; If you don't have the bptm directory under the =
&quot;logs&quot; directory, you've implicitly turned off logging for =
the bptm daemon.&nbsp; </FONT></P>

<P><FONT SIZE=3D2>You have to create this (and other) directories to =
have full logging.&nbsp; See the &quot;Debug logs&quot; section of the =
troubleshooting guide for a list of the possible =
directories.</FONT></P>

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

<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: Feroz F. Basir [<A =
HREF=3D"mailto:dbase77 AT yahoo DOT com">mailto:dbase77 AT yahoo DOT 
com</A>]</FONT>
<BR><FONT SIZE=3D2>Sent: Friday, March 14, 2003 1:03 PM</FONT>
<BR><FONT SIZE=3D2>To: Donaldson, Mark</FONT>
<BR><FONT SIZE=3D2>Cc: Veritasbu (E-mail)</FONT>
<BR><FONT SIZE=3D2>Subject: RE: [Veritas-bu] 2 tape drives issue</FONT>
</P>
<BR>

<P><FONT SIZE=3D2>Hi,</FONT>
</P>

<P><FONT SIZE=3D2>This is weird. I changed buffer size to default =
32k</FONT>
<BR><FONT SIZE=3D2>and no. of buffer to 8. And I run my restore =
again.</FONT>
<BR><FONT SIZE=3D2>This time it only took about 30 minutes to restore =
35</FONT>
<BR><FONT SIZE=3D2>Gb data. That is half of the actual total size of =
70</FONT>
<BR><FONT SIZE=3D2>GB. Tell me something, how buffer size can affect =
the</FONT>
<BR><FONT SIZE=3D2>restore? I mean increase it good for backup but =
very</FONT>
<BR><FONT SIZE=3D2>bad for restore. Small value&nbsp; in buffer size is =
very</FONT>
<BR><FONT SIZE=3D2>good for restore. I am very confuse here. </FONT>
</P>

<P><FONT SIZE=3D2>Here is my setting:</FONT>
</P>

<P><FONT SIZE=3D2>buffer size 256K, num of buffer 16. Give backup =
time</FONT>
<BR><FONT SIZE=3D2>to 38 minutes for 74 GB oracle data. Restore half =
of</FONT>
<BR><FONT SIZE=3D2>the size (35 GB) give me 3 hrs.</FONT>
</P>

<P><FONT SIZE=3D2>buffer size 32K, num of buffer 8. Give backup time =
5</FONT>
<BR><FONT SIZE=3D2>hrs. Restore half of the size (35 GB) give me =
30</FONT>
<BR><FONT SIZE=3D2>minutes only.</FONT>
</P>

<P><FONT SIZE=3D2>I hope somebody can explain the reason behind this. =
I</FONT>
<BR><FONT SIZE=3D2>mean what is the best setting I can use in my</FONT>
<BR><FONT SIZE=3D2>scenario.</FONT>
</P>

<P><FONT SIZE=3D2>Another thing is, bptm log. where about is this =
log</FONT>
<BR><FONT SIZE=3D2>file? can you give me the actual log file name. =
i</FONT>
<BR><FONT SIZE=3D2>tried to search whole system, no luck at all. am =
i</FONT>
<BR><FONT SIZE=3D2>missing something here or what?</FONT>
</P>

<P><FONT SIZE=3D2>Thank you again.</FONT>
</P>

<P><FONT SIZE=3D2>regards,</FONT>
<BR><FONT SIZE=3D2>feroz </FONT>
</P>

<P><FONT SIZE=3D2>&lt;snip&gt;</FONT>
</P>

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