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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.<span
style='font-size:10.0pt;font-family:Arial;color:navy'>

<span style='font-size:

10.0pt;font-family:Arial;color:navy'>†

 <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.


<span style='font-size:

10.0pt;font-family:Arial;color:navy'>†

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

color:navy;mso-no-proof:yes'>"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."

<span style='font-size:18.0pt;

font-family:"Comic Sans MS";color:navy;mso-no-proof:yes'>Christopher R. Spence<font color=navy>
<span

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

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

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

<span style='font-size:10.0pt;

font-family:"Comic Sans MS";color:navy;mso-no-proof:yes'>Fuelspot<font color=navy>
<span

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

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

<span

style='font-size:10.0pt;font-family:Tahoma'>-----Original Message----- From: Hallas John
[mailto:John.Hallas_at_btcellnet.net]
Sent<span
style='font-weight:bold'>: Thursday, September 13, 2001 10:01 AM To: Multiple recipients of list <font
 size=2 face=Tahoma>ORACLE-L<font
size=2 face=Tahoma>
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

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-- 
Author: 
† INET: nlzanen1_at_EY.NL



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

Original text of this message

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