From jonathan@jlcomp.demon.co.uk Thu, 13 Sep 2001 12:16:40 -0700 From: "Jonathan Lewis" Date: Thu, 13 Sep 2001 12:16:40 -0700 Subject: Re: I/O Performance/bottlenecks on EMC Symmetrix Message-ID: MIME-Version: 1.0 Content-Type: text/plain !! Please do not post Off Topic to this List !! I have had, and heard of, poor performance from EMC boxes before now because of the big black box principal. You might check out James Morle's book (scaling Oracle 8i) for some thoughts. >From an Oracle perspective, you may find that simply checking v$filestat will demonstrate quite clearly that the average read time off disk is very poor - the last big site I went to were getting read times of worse than 100 millisecs - when EMC were claiming to offer better than 20 millisecs. If this doesn't help, there is a C program on my web-site (under a Miscellanous or Performance article on choosing a block size) which allows you to create a file, and then start emulating random "Oracle-read" I/Os - this should give you a quick way of testing the real response time of the black box. Jonathan Lewis http://www.jlcomp.demon.co.uk Host to The Co-Operative Oracle Users' FAQ http://www.jlcomp.demon.co.uk/faq/ind_faq.html Author of: Practical Oracle 8i: Building Efficient Databases Screen saver or Life saver: http://www.ud.com Use spare CPU to assist in cancer research. -----Original Message----- To: Multiple recipients of list ORACLE-L Date: 13 September 2001 16:30 !! Please do not post Off Topic to this List !! Hi, The other workload I would say was about the same (Relatively speaking) Both machines did have idle time on the CPU (I/O intensive job). The quicker test machine was a bit stretched on memory at the time (running about 8 databases) but not too bad. The only thing I can think of is pi** poor performance (3 p's you don't want in marketing) of the symmetrix disks. One point this symmetrix is loaded with 36 Gb disks and all of them are sliced to pieces and than allocated to filesystems. In theory you can be sharing disks with other high I/O apps (E-mail system etc..). I do not however have any insight in what is where physically. Jack -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Jonathan Lewis INET: jonathan@jlcomp.demon.co.uk 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@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).