HITACHI was RE: I/O Performance/bottlenecks on EMC Symmetrix

From: Mohan, Ross <MohanR_at_STARS-SMI.com>
Date: Mon, 24 Sep 2001 13:50:02 -0700
Message-ID: <F001.00396EE9.20010924140725@fatcity.com>

Anyone aware of the related tools for HITACHI Storage Boxes?

Mucho Appreciado in advance......

-----Original Message-----

Sent: Friday, September 14, 2001 4:39 PM To: Multiple recipients of list ORACLE-L

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We use EMC Symmetrics. When I got here, the folks who set things up initially where under the impression that you will never have to worry about placement/io with a Symm. Wrong! I underwent a painstaking process of relaying out the disks according to conventions DBA normally use taking into consideration index/data/volume of read/write to physical disks. Since you are presented with logical volumes, we use sym commands on each of our hosts connected to the symm to give us a graphical layout of all the logical volumes on the physical disks. EMC has a tool to do this called Resource View. EMC also has a tool called workload analyzer to analyze activity on each fa / disk, etc. And there is also a utility called Symm Optimizer to detect hot spots and optionally, replace that data to a different physical disk. You should find out if you have any of these tools available to you.

HTH
Michele Armstrong

-----Original Message-----

Sent: Thursday, September 13, 2001 7:55 AM To: Multiple recipients of list ORACLE-L

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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: Armstrong, Michele
INET: marmstrong_at_fairpoint.com

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