Veritas-bu

[Veritas-bu] 2 tape drives issue

2003-03-14 12:04:52
Subject: [Veritas-bu] 2 tape drives issue
From: Mark.Donaldson AT experianems DOT com (Donaldson, Mark)
Date: Fri, 14 Mar 2003 10:04:52 -0700
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(snipped & resent to list)

Restores always take longer than backups; there's probably a good reason but
I've never delved too deeply into it.  I plan approximately (1.5 *
backuptime) to estimate restore time.  There's a "Performance & Tuning"
guide you can download from Veritas if you wish.  Indexing the image
database is a suggestion for enhancing restore speeds.

Multiplexed backups take longer to restore and/or duplicate, too.

I thought there was a separate buffer setting for restores but I'm having
trouble finding a reference so I may be remembering wrong.

To verify your buffer settings, search the bptm log file for lines like
this:
[2851788] <2> io_init: setting send network buffer to 262144 bytes
[2851788] <2> io_init: using 32 data buffers
[2851788] <2> io_init: buffer size for read is 262144

-M

-----Original Message-----
From: Feroz F. Basir [mailto:dbase77 AT yahoo DOT com]
Sent: Friday, March 14, 2003 6:10 AM
To: Donaldson, Mark
Cc: Veritasbu (E-mail)
Subject: RE: [Veritas-bu] 2 tape drives issue


Hi,

OK, I increase my buffer size to 256K and no. of
buffer is 16. Good news is, backup took 38 minutes for
74 GB oracle datafile. Very happy. But not yet as
restore took longer though, in fact it still running
after past 1 hr mark. What am I doing wrong here? Am I
not allow to have win:win situation here? Or win:lose
situation? Do you think I can have balance situation? 

Anybody want to share their experience regarding this
issue?

Thank you in advance.

regards,
feroz 

<snip>

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<TITLE>RE: [Veritas-bu] 2 tape drives issue</TITLE>
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<P><FONT SIZE=3D2>(snipped &amp; resent to list)</FONT>
</P>

<P><FONT SIZE=3D2>Restores always take longer than backups; there's =
probably a good reason but I've never delved too deeply into it.&nbsp; =
I plan approximately (1.5 * backuptime) to estimate restore time.&nbsp; =
There's a &quot;Performance &amp; Tuning&quot; guide you can download =
from Veritas if you wish.&nbsp; Indexing the image database is a =
suggestion for enhancing restore speeds.</FONT></P>

<P><FONT SIZE=3D2>Multiplexed backups take longer to restore and/or =
duplicate, too.</FONT>
</P>

<P><FONT SIZE=3D2>I thought there was a separate buffer setting for =
restores but I'm having trouble finding a reference so I may be =
remembering wrong.</FONT></P>

<P><FONT SIZE=3D2>To verify your buffer settings, search the bptm log =
file for lines like this:</FONT>
<BR><FONT SIZE=3D2>[2851788] &lt;2&gt; io_init: setting send network =
buffer to 262144 bytes</FONT>
<BR><FONT SIZE=3D2>[2851788] &lt;2&gt; io_init: using 32 data =
buffers</FONT>
<BR><FONT SIZE=3D2>[2851788] &lt;2&gt; io_init: buffer size for read is =
262144</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 6:10 AM</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>OK, I increase my buffer size to 256K and no. =
of</FONT>
<BR><FONT SIZE=3D2>buffer is 16. Good news is, backup took 38 minutes =
for</FONT>
<BR><FONT SIZE=3D2>74 GB oracle datafile. Very happy. But not yet =
as</FONT>
<BR><FONT SIZE=3D2>restore took longer though, in fact it still =
running</FONT>
<BR><FONT SIZE=3D2>after past 1 hr mark. What am I doing wrong here? Am =
I</FONT>
<BR><FONT SIZE=3D2>not allow to have win:win situation here? Or =
win:lose</FONT>
<BR><FONT SIZE=3D2>situation? Do you think I can have balance =
situation? </FONT>
</P>

<P><FONT SIZE=3D2>Anybody want to share their experience regarding =
this</FONT>
<BR><FONT SIZE=3D2>issue?</FONT>
</P>

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