RE: I/O Performance/bottlenecks on EMC Symmetrix

[Christopher Spence]

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

Rules of tuning databases.   There is always a bottleneck. 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----- From: Hallas John [mailto:[EMAIL PROTECTED]] Sent: Thursday, September 13, 2001 10:01 AM To: Multiple recipients of list ORACLE-L Subject: RE: I/O Performance/bottlenecks on EMC Symmetrix   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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: 13 September 01 12:55 To: Multiple recipients of list ORACLE-L Subject: I/O Performance/bottlenecks on EMC Symmetrix   !! 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 ===================================================================== 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. 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