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Re:RE: I/O Performance/bottlenecks on EMC Symmetrix

From: <dgoulet_at_vicr.com>
Date: Thu, 13 Sep 2001 07:45:49 -0700
Message-ID: <F001.0038D232.20010913070018@fatcity.com>

!! 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 <John.Hallas_at_btcellnet.net>
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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The information contained in this communication is confidential and is intended solely for the use of the individual or entity to whom it is addressed. You should not copy, disclose or distribute this communication without the authority of Ernst & Young. Ernst & Young is neither liable for the proper and complete transmission of the information contained in this communication nor for any delay in its receipt. Ernst & Young does not guarantee that the integrity of this communication has been maintained nor that the communication is free of viruses, interceptions or interference.

If you are not the intended recipient of this communication please return the communication to the sender and delete and destroy all copies.

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Author:
  INET: nlzanen1_at_EY.NL

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
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<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: nlzanen1_at_EY.NL [<A HREF="mailto:nlzanen1_at_EY.NL">mailto:nlzanen1_at_EY.NL</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 &amp;</FONT>
<BR><FONT SIZE=2>Young, niet toegestaan. Ernst &amp; 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 &amp; 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 kopieŽn te verwijderen en te vernietigen.</FONT>
</P>

<P><FONT SIZE=2>Ernst &amp; 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 it is</FONT>
<BR><FONT SIZE=2>addressed. You should not copy, disclose or distribute this communication</FONT>
<BR><FONT SIZE=2>without the authority of Ernst &amp; Young. Ernst &amp; Young is neither liable for</FONT>
<BR><FONT SIZE=2>the proper and complete transmission of the information contained in this</FONT>
<BR><FONT SIZE=2>communication nor for any delay in its receipt. Ernst &amp; Young does not</FONT>
<BR><FONT SIZE=2>guarantee that the integrity of this communication has been maintained nor</FONT>
<BR><FONT SIZE=2>that the communication is free of viruses, interceptions or interference.</FONT>
</P>

<P><FONT SIZE=2>If you are not the intended recipient of this communication please return</FONT>
<BR><FONT SIZE=2>the communication to the sender and delete and destroy all copies.</FONT>
</P>

<P><FONT SIZE=2>In carrying out its engagements, Ernst &amp; Young applies general terms and</FONT>
<BR><FONT SIZE=2>conditions, which contain a clause that limits its liability. A copy of</FONT>
<BR><FONT SIZE=2>these terms and conditions is available on request free of charge.</FONT>
<BR><FONT

SIZE=2>=====================================================================</FO
NT>
</P>
<BR>
<BR>
<BR>
<BR>

<P><FONT SIZE=2>-- </FONT>
<BR><FONT SIZE=2>Please see the official ORACLE-L FAQ: <A HREF="http://www.orafaq.com" TARGET="_blank">http://www.orafaq.com</A></FONT>

<BR><FONT SIZE=2>-- </FONT>
<BR><FONT SIZE=2>Author: </FONT>
<BR><FONT SIZE=2>&nbsp; INET: nlzanen1_at_EY.NL</FONT>
</P>

<P><FONT SIZE=2>Fat City Network Services&nbsp;&nbsp;&nbsp; -- (858) 538-5051&nbsp; FAX: (858) 538-5051</FONT> <BR><FONT SIZE=2>San Diego, California&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
-- Public Internet access / Mailing Lists</FONT>
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SIZE=2>--------------------------------------------------------------------</FON
T>
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Author:
  INET: dgoulet_at_vicr.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
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Received on Thu Sep 13 2001 - 09:45:49 CDT

Original text of this message

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