RE: I/O Performance/bottlenecks on EMC Symmetrix

From: Christopher Spence <cspence_at_FuelSpot.com>
Date: Fri, 14 Sep 2001 05:48:06 -0700
Message-ID: <F001.0038E5CC.20010914054519@fatcity.com>

<span

style='font-size:10.0pt;font-family:Arial;color:navy'>Rules of tuning databases.

<font

     size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
     Arial'>There is always a bottleneck.
 <font
     size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
     Arial'>Once you solve the bottle neck, refer to rule number 1.

"Do not criticize someone until you walked a mile in their shoes, that way when you criticize them, you are a mile a way and have their shoes."

Christopher R. Spence
<span

style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy;mso-no-proof: yes'>Oracle DBA
<span

style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy;mso-no-proof: yes'>Phone: (978) 322-5744
<span

style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy;mso-no-proof: yes'>Fax: (707) 885-2275

Fuelspot
<span

style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy;mso-no-proof: yes'>73 Princeton Street
<span

style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy;mso-no-proof: yes'>North, Chelmsford 01863

<span

style='font-size:10.0pt;font-family:Tahoma'>-----Original Message----- From: Hallas John
[mailto:John.Hallas_at_btcellnet.net]
Sent: Thursday, September 13, 2001 10:01 AM To: Multiple recipients of list ORACLE-L
Subject: RE: I/O
Performance/bottlenecks on EMC Symmetrix

<span

style='font-size:12.0pt'>

<span

style='font-size:10.0pt'>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.

<span

style='font-size:10.0pt'>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.

<span

style='font-size:10.0pt'>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.

<span

style='font-size:10.0pt'>John

<span

style='font-size:10.0pt'>-----Original Message----- From: nlzanen1_at_EY.NL [<a
href="mailto:nlzanen1_at_EY.NL">mailto:nlzanen1_at_EY.NL] Sent: 13 September 01 12:55

To: Multiple recipients of list
ORACLE-L
Subject: I/O
Performance/bottlenecks on EMC Symmetrix

<span

style='font-size:12.0pt'>

<span

style='font-size:10.0pt'>!! Please do not post Off Topic to this List !!

<span

style='font-size:10.0pt'>Hi All,

<span

style='font-size:12.0pt'>

<span

style='font-size:10.0pt'>Does anybody here on the list have experience with EMC/symmetrix storage
units.?

<span

style='font-size:10.0pt'>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.

<span

style='font-size:10.0pt'>Who can give me pointers about I/O throughput that can be reached,
configuration pittfalls etc..

<span

style='font-size:10.0pt'>Example:
RS6000 8CPU's and 4Gb memory with
storage on EMC/symmetrix. Job takes about 2 hours to complete.

<span

style='font-size:10.0pt'>F50 1 CPU 1Gb memory (TEST machine) local disks. same job takes 0.5 hours
to complete.

<span

style='font-size:12.0pt'>

<span

style='font-size:10.0pt'>Jack

<span

style='font-size:10.0pt'>=====================================================================

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.

<span

style='font-size:10.0pt'>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.

<span

style='font-size:10.0pt'>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.

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.

<span

style='font-size:10.0pt'>If you are not the intended recipient of this communication please return
the communication to the sender and
delete and destroy all copies.

<span

style='font-size:10.0pt'>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.

<span

style='font-size:10.0pt'>--
Please see the official ORACLE-L
FAQ: http://www.orafaq.com

-- 
Author: 
  INET: nlzanen1_at_EY.NL




<span

style='font-size:10.0pt'>Fat City Network Services    -- (858)
538-5051  FAX: (858) 538-5051 
San Diego,
California        -- Public Internet access
/ Mailing Lists 
--------------------------------------------------------------------

To REMOVE yourself from this
mailing list, send an E-Mail message 
to: ListGuru_at_fatcity.com (note
EXACT spelling of 'ListGuru') and in 
the message BODY, include a line
containing: UNSUB ORACLE-L 
(or the name of mailing list you
want to be removed from).  You may 
also send the HELP command for other
information (like subscribing). 



<span

style='font-size:12.0pt;font-family:"Courier New"'>



<span style='mso-ansi-font-size:12.0pt;

mso-bidi-font-size:12.0pt'>**********************************************************************


<span style='mso-ansi-font-size:12.0pt;

mso-bidi-font-size:12.0pt'>This email and any attachments may be confidential
and the subject of


<span style='mso-ansi-font-size:12.0pt;

mso-bidi-font-size:12.0pt'>legal professional privilege. Any disclosure, use,
storage or copying


<span style='mso-ansi-font-size:12.0pt;

mso-bidi-font-size:12.0pt'>of this email without the consent of the sender is
strictly prohibited.


<span style='mso-ansi-font-size:12.0pt;

mso-bidi-font-size:12.0pt'>Please notify the sender immediately if you are not
the intended


<span style='mso-ansi-font-size:12.0pt;

mso-bidi-font-size:12.0pt'>recipient and then delete the email from your inbox
and do not


<span style='mso-ansi-font-size:12.0pt;

mso-bidi-font-size:12.0pt'>disclose the contents to another person, use, copy
or store the


<span style='mso-ansi-font-size:12.0pt;

mso-bidi-font-size:12.0pt'>information in any medium.


<span style='mso-ansi-font-size:12.0pt;

mso-bidi-font-size:12.0pt'>**********************************************************************

Received on Fri Sep 14 2001 - 07:48:06 CDT