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[Veritas-bu] tape drive performance on image copies
2002-08-28 13:08:41
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-altreadhost?
is this a bpduplicate option? I don't see it in my v3.4, is it 4.5?
-M
-----Original Message-----
From: Ballowe, Charles [mailto:CBallowe AT usg DOT com]
Sent: Wednesday, August 28, 2002 10:11 AM
To: 'Eric Forgette'
Cc: 'veritas-bu AT mailman.eng.auburn DOT edu'
Subject: RE: [Veritas-bu] tape drive performance on image copies
are you using a read host that is the same as your write host, things
go much faster with -altreadhost rather than reading on one drive,
sending data over the network, and writing on a different host.
just a thought
> -----Original Message-----
> From: Eric Forgette [mailto:epforgette AT overnite DOT com]
> Sent: Wednesday, August 28, 2002 10:15 AM
> To: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: [Veritas-bu] tape drive performance on image copies
>
>
> I wrote a perl script to duplicate the most recent, successful, full
> backup images for a particular class. The script is available at
> http://perlvault.sourceforge.net/ (beta release still...)
>
> The problem I am having is in the performance of the image copies. My
> expectation was that the tape to tape copies would be faster than the
> backups themselves. The regular backup performance is limited by the
> fact that there are tons of small files and by the network speed / cpu
> speed of the client. My understanding is that the images
> (once on tape)
> are one sequential file, which should lend itself well to copying.
>
> The master is an E4500 running Solaris 5.8. I am using LTO
> drives which
> are SAN attached. I've seen throughput (using iostat) of 11 MB/second
> during regular backups. During the image copies, I get between 5 - 7
> MB/second. The regular backups do not use any multiplexing.
>
> Is there any tuning parameters I can tweak?
> Anyone have any ideas?
>
> Regards,
> -Eric
> --
> Eric Forgette
> Unix Systems Administrator
> _______________________________________________
> Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>
_______________________________________________
Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
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<P><FONT SIZE=3D2>-altreadhost?</FONT>
</P>
<P><FONT SIZE=3D2>is this a bpduplicate option? I don't see it in =
my v3.4, is it 4.5?</FONT>
</P>
<P><FONT SIZE=3D2>-M</FONT>
</P>
<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: Ballowe, Charles [<A =
HREF=3D"mailto:CBallowe AT usg DOT com">mailto:CBallowe AT usg DOT
com</A>]</FONT>
<BR><FONT SIZE=3D2>Sent: Wednesday, August 28, 2002 10:11 AM</FONT>
<BR><FONT SIZE=3D2>To: 'Eric Forgette'</FONT>
<BR><FONT SIZE=3D2>Cc: 'veritas-bu AT mailman.eng.auburn DOT edu'</FONT>
<BR><FONT SIZE=3D2>Subject: RE: [Veritas-bu] tape drive performance on =
image copies</FONT>
</P>
<BR>
<P><FONT SIZE=3D2>are you using a read host that is the same as your =
write host, things</FONT>
<BR><FONT SIZE=3D2>go much faster with -altreadhost rather than reading =
on one drive,</FONT>
<BR><FONT SIZE=3D2>sending data over the network, and writing on a =
different host.</FONT>
</P>
<P><FONT SIZE=3D2>just a thought</FONT>
</P>
<P><FONT SIZE=3D2>> -----Original Message-----</FONT>
<BR><FONT SIZE=3D2>> From: Eric Forgette [<A =
HREF=3D"mailto:epforgette AT overnite DOT com">mailto:epforgette AT overnite
DOT com</=
A>]</FONT>
<BR><FONT SIZE=3D2>> Sent: Wednesday, August 28, 2002 10:15 =
AM</FONT>
<BR><FONT SIZE=3D2>> To: veritas-bu AT mailman.eng.auburn DOT edu</FONT>
<BR><FONT SIZE=3D2>> Subject: [Veritas-bu] tape drive performance on =
image copies</FONT>
<BR><FONT SIZE=3D2>> </FONT>
<BR><FONT SIZE=3D2>> </FONT>
<BR><FONT SIZE=3D2>> I wrote a perl script to duplicate the most =
recent, successful, full</FONT>
<BR><FONT SIZE=3D2>> backup images for a particular class. The =
script is available at</FONT>
<BR><FONT SIZE=3D2>> <A HREF=3D"http://perlvault.sourceforge.net/"; =
TARGET=3D"_blank">http://perlvault.sourceforge.net/</A> (beta release =
still...)</FONT>
<BR><FONT SIZE=3D2>> </FONT>
<BR><FONT SIZE=3D2>> The problem I am having is in the performance =
of the image copies. My</FONT>
<BR><FONT SIZE=3D2>> expectation was that the tape to tape copies =
would be faster than the</FONT>
<BR><FONT SIZE=3D2>> backups themselves. The regular backup =
performance is limited by the</FONT>
<BR><FONT SIZE=3D2>> fact that there are tons of small files and by =
the network speed / cpu</FONT>
<BR><FONT SIZE=3D2>> speed of the client. My understanding is =
that the images </FONT>
<BR><FONT SIZE=3D2>> (once on tape)</FONT>
<BR><FONT SIZE=3D2>> are one sequential file, which should lend =
itself well to copying.</FONT>
<BR><FONT SIZE=3D2>> </FONT>
<BR><FONT SIZE=3D2>> The master is an E4500 running Solaris =
5.8. I am using LTO </FONT>
<BR><FONT SIZE=3D2>> drives which</FONT>
<BR><FONT SIZE=3D2>> are SAN attached. I've seen throughput =
(using iostat) of 11 MB/second</FONT>
<BR><FONT SIZE=3D2>> during regular backups. During the image =
copies, I get between 5 - 7</FONT>
<BR><FONT SIZE=3D2>> MB/second. The regular backups do not use =
any multiplexing.</FONT>
<BR><FONT SIZE=3D2>> </FONT>
<BR><FONT SIZE=3D2>> Is there any tuning parameters I can =
tweak? </FONT>
<BR><FONT SIZE=3D2>> Anyone have any ideas?</FONT>
<BR><FONT SIZE=3D2>> </FONT>
<BR><FONT SIZE=3D2>> Regards,</FONT>
<BR><FONT SIZE=3D2>> -Eric</FONT>
<BR><FONT SIZE=3D2>> -- </FONT>
<BR><FONT SIZE=3D2>> Eric Forgette</FONT>
<BR><FONT SIZE=3D2>> Unix Systems Administrator</FONT>
<BR><FONT SIZE=3D2>> =
_______________________________________________</FONT>
<BR><FONT SIZE=3D2>> Veritas-bu maillist - =
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>
<BR><FONT SIZE=3D2>> </FONT>
<BR><FONT =
SIZE=3D2>_______________________________________________</FONT>
<BR><FONT SIZE=3D2>Veritas-bu maillist - =
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>
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