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>

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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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Author:
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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----- From: nlzanen1_at_EY.NL [<A HREF="mailto:nlzanen1_at_EY.NL">mailto:nlzanen1_at_EY.NL</A>]

<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>

!! Please do not post Off Topic to this List !!

<P><FONT SIZE=2>Hi All,</FONT>
</P>
<BR>

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

<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
 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

<BR><FONT SIZE=2>to complete.</FONT>
</P>
<BR>

Jack

<FONT

SIZE=2>=====================================================================</FO

NT>
 De informatie verzonden in dit e-mailbericht is vertrouwelijk en is
 uitsluitend bestemd voor de geadresseerde. Openbaarmaking,
 vermenigvuldiging, verspreiding en/of verstrekking van deze informatie aan
 derden is, behoudens voorafgaande schriftelijke toestemming van Ernst &
 Young, niet toegestaan. Ernst & Young staat niet in voor de juiste en
 volledige overbrenging van de inhoud van een verzonden e-mailbericht, noch
 voor tijdige ontvangst daarvan. Ernst & Young kan niet garanderen dat een
 verzonden e-mailbericht vrij is van virussen, noch dat e-mailberichten
 worden overgebracht zonder inbreuk of tussenkomst van onbevoegde derden.

Indien bovenstaand e-mailbericht niet aan u is gericht, verzoeken wij u
 vriendelijk doch dringend het e-mailbericht te retourneren aan de verzender
 en het origineel en eventuele kopieën te verwijderen en te vernietigen.

Ernst & Young hanteert bij de uitoefening van haar werkzaamheden algemene
 voorwaarden, waarin een beperking van aansprakelijkheid is opgenomen. De
 algemene voorwaarden worden u op verzoek kosteloos toegezonden.
 <FONT

SIZE=2>=====================================================================</FO

NT>
 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.

In carrying out its engagements, Ernst & Young applies general terms and
 conditions, which contain a clause that limits its liability. A copy of
 these terms and conditions is available on request free of charge.
 <FONT

SIZE=2>=====================================================================</FO

NT>

</P>
<BR>
<BR>
<BR>
<BR>

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

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Author:
  INET: dgoulet_at_vicr.com

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Received on Thu Sep 13 2001 - 09:45:49 CDT