!! Please do not post Off Topic to this List !!
Try Precise Software's DBTuner product. It has some sort of EMC proprietary
connection into the storage array so that you can actually see what disks are
being whacked.
Dick Goulet
____________________Reply Separator____________________
Author: Hallas John <[EMAIL PROTECTED]>
Date: 9/13/2001 6:00 AM
At one site I worked using Oracle Financials we were having serious
performance problems at what seemed to us random intervals. Spent months
looking at the database after the Unix boys had said that there was no way
we could have I/O problems with the throughput capabililities of EMC and the
Symetrix set up we had.
Eventually turned out that 3 systems were sharing the same disks and the
disks had not been striped. Therefore other system were causing us
performance problems.
If you have an EMC support contract which I think you must have you, the
SA's get all the free GUI tools that allow them to look at channels and
logical/physical layout. Ask them about.
John
-----Original Message-----
Sent: 13 September 01 12:55
To: Multiple recipients of list ORACLE-L
!! Please do not post Off Topic to this List !!
Hi All,
Does anybody here on the list have experience with EMC/symmetrix storage
units.?
We have our databases on this machine and I have a feeling the the I/O
performance is not very good. I can not proof it since I do not have any
experience/data/access to that machine. We do however have a very
cooperative UNIX group but they also lack experience with performance on
this machine.
Who can give me pointers about I/O throughput that can be reached,
configuration pittfalls etc..
Example:
RS6000 8CPU's and 4Gb memory with storage on EMC/symmetrix. Job takes about
2 hours to complete.
F50 1 CPU 1Gb memory (TEST machine) local disks. same job takes 0.5 hours
to complete.
Jack
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<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META NAME="Generator" CONTENT="MS Exchange Server version 5.5.2653.12">
<TITLE>RE: I/O Performance/bottlenecks on EMC Symmetrix</TITLE>
</HEAD>
<BODY>
<P><FONT SIZE=2>At one site I worked using Oracle Financials we were having
serious performance problems at what seemed to us random intervals. Spent months
looking at the database after the Unix boys had said that there was no way we
could have I/O problems with the throughput capabililities of EMC and the
Symetrix set up we had.</FONT></P>
<P><FONT SIZE=2>Eventually turned out that 3 systems were sharing the same disks
and the disks had not been striped. Therefore other system were causing us
performance problems.</FONT></P>
<P><FONT SIZE=2>If you have an EMC support contract which I think you must have
you, the SA's get all the free GUI tools that allow them to look at channels and
logical/physical layout. Ask them about.</FONT></P>
<P><FONT SIZE=2>John</FONT>
</P>
<P><FONT SIZE=2>-----Original Message-----</FONT>
<BR><FONT SIZE=2>From: [EMAIL PROTECTED] [<A
HREF="mailto:[EMAIL PROTECTED]";>mailto:[EMAIL PROTECTED]</A>]</FONT>
<BR><FONT SIZE=2>Sent: 13 September 01 12:55</FONT>
<BR><FONT SIZE=2>To: Multiple recipients of list ORACLE-L</FONT>
<BR><FONT SIZE=2>Subject: I/O Performance/bottlenecks on EMC Symmetrix</FONT>
</P>
<BR>
<P><FONT SIZE=2>!! Please do not post Off Topic to this List !!</FONT>
</P>
<P><FONT SIZE=2>Hi All,</FONT>
</P>
<BR>
<P><FONT SIZE=2>Does anybody here on the list have experience with EMC/symmetrix
storage</FONT>
<BR><FONT SIZE=2>units.?</FONT>
</P>
<P><FONT SIZE=2>We have our databases on this machine and I have a feeling the
the I/O</FONT>
<BR><FONT SIZE=2>performance is not very good. I can not proof it since I do not
have any</FONT>
<BR><FONT SIZE=2>experience/data/access to that machine. We do however have a
very</FONT>
<BR><FONT SIZE=2>cooperative UNIX group but they also lack experience with
performance on</FONT>
<BR><FONT SIZE=2>this machine.</FONT>
</P>
<P><FONT SIZE=2>Who can give me pointers about I/O throughput that can be
reached,</FONT>
<BR><FONT SIZE=2>configuration pittfalls etc..</FONT>
</P>
<P><FONT SIZE=2>Example:</FONT>
<BR><FONT SIZE=2>RS6000 8CPU's and 4Gb memory with storage on EMC/symmetrix. Job
takes about</FONT>
<BR><FONT SIZE=2>2 hours to complete.</FONT>
</P>
<P><FONT SIZE=2>F50 1 CPU 1Gb memory (TEST machine) local disks. same job takes
0.5 hours</FONT>
<BR><FONT SIZE=2>to complete.</FONT>
</P>
<BR>
<P><FONT SIZE=2>Jack</FONT>
</P>
<P><FONT
SIZE=2>=====================================================================</FO
NT>
<BR><FONT SIZE=2>De informatie verzonden in dit e-mailbericht is vertrouwelijk
en is</FONT>
<BR><FONT SIZE=2>uitsluitend bestemd voor de geadresseerde.
Openbaarmaking,</FONT>
<BR><FONT SIZE=2>vermenigvuldiging, verspreiding en/of verstrekking van deze
informatie aan</FONT>
<BR><FONT SIZE=2>derden is, behoudens voorafgaande schriftelijke toestemming van
Ernst &</FONT>
<BR><FONT SIZE=2>Young, niet toegestaan. Ernst & Young staat niet in voor de
juiste en</FONT>
<BR><FONT SIZE=2>volledige overbrenging van de inhoud van een verzonden
e-mailbericht, noch</FONT>
<BR><FONT SIZE=2>voor tijdige ontvangst daarvan. Ernst & Young kan niet
garanderen dat een</FONT>
<BR><FONT SIZE=2>verzonden e-mailbericht vrij is van virussen, noch dat
e-mailberichten</FONT>
<BR><FONT SIZE=2>worden overgebracht zonder inbreuk of tussenkomst van
onbevoegde derden.</FONT>
</P>
<P><FONT SIZE=2>Indien bovenstaand e-mailbericht niet aan u is gericht,
verzoeken wij u</FONT>
<BR><FONT SIZE=2>vriendelijk doch dringend het e-mailbericht te retourneren aan
de verzender</FONT>
<BR><FONT SIZE=2>en het origineel en eventuele kopieën te verwijderen en te
vernietigen.</FONT>
</P>
<P><FONT SIZE=2>Ernst & Young hanteert bij de uitoefening van haar
werkzaamheden algemene</FONT>
<BR><FONT SIZE=2>voorwaarden, waarin een beperking van aansprakelijkheid is
opgenomen. De</FONT>
<BR><FONT SIZE=2>algemene voorwaarden worden u op verzoek kosteloos
toegezonden.</FONT>
<BR><FONT
SIZE=2>=====================================================================</FO
NT>
<BR><FONT SIZE=2>The information contained in this communication is confidential
and is</FONT>
<BR><FONT SIZE=2>intended solely for the use of the individual or entity to whom
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<BR><FONT SIZE=2>addressed. You should not copy, disclose or distribute this
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<P><FONT SIZE=2>If you are not the intended recipient of this communication
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<P><FONT SIZE=2>In carrying out its engagements, Ernst & Young applies
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copy of</FONT>
<BR><FONT SIZE=2>these terms and conditions is available on request free of
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SIZE=2>=====================================================================</FO
NT>
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<BR><FONT SIZE=2> INET: [EMAIL PROTECTED]</FONT>
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<P><FONT SIZE=2>Fat City Network Services -- (858)
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