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RE: I/O Performance/bottlenecks on EMC Symmetrix

From: Rachel Carmichael <carmichr_at_hotmail.com>
Date: Fri, 14 Sep 2001 09:40:15 -0700
Message-ID: <F001.0038EE1F.20010914094527@fatcity.com>

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

corollary to rule 2

after a certain point, just stop. It ain't worth it anymore.

>From: Christopher Spence <cspence_at_FuelSpot.com>
>Reply-To: ORACLE-L_at_fatcity.com
>To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
>Subject: RE: I/O Performance/bottlenecks on EMC Symmetrix
>Date: Fri, 14 Sep 2001 05:45:20 -0800
>
>Rules of tuning databases.
>
>1. There is always a bottleneck.
>2. 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
>Oracle DBA
>Phone: (978) 322-5744
>Fax: (707) 885-2275
>Fuelspot
>73 Princeton Street
>North, Chelmsford 01863
>
>-----Original Message-----
>Sent: Thursday, September 13, 2001 10:01 AM
>To: Multiple recipients of list ORACLE-L
>
>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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Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Rachel Carmichael
  INET: carmichr_at_hotmail.com

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Received on Fri Sep 14 2001 - 11:40:15 CDT

Original text of this message

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