So ibm would rather an outside vendor do the measurements? and that any customer with performance problems should run future or unsupported levels of code in production? And that vm developement's opinions are better than real data? my my.
>Date: Thu, 18 Nov 2004 18:12:50 +0100 >From: Carsten Otte <[EMAIL PROTECTED]> > >>Hi Carsten, i just don't believe that under stress conditions >>that in today's environement you can show value to paging >>to dcss over vdisk. This being with z/vm 5.1 and a current >>redhat or suse. >Why don't you measure it? My simple measurements (I am not a >performance guy but the developer) indicate a strong benefit. > >>The ibm recomendations i keep hearing being repeated are that >>swap sizes must be some multiple of the linux virtual machine >>size. So if my Oracle server requires 2GB, then (some) ibm do >>says i should have 4GB of swap. and in today's environement, i >>can not have a discontigous virtual machine, so swap dcss must >>be at the top of virtual storage. but that would be over the 2gb >>line. not possible - with what is available or announced as far >>as i know. mixing dcss and vdisk seems to create a more complex >>environment than most installations want to utilize. after all, >>vm is just a hypervisor i'm told. >Sles9 will allow to have discontiguous storage very soon. So >does Rhel4. And Vanilla Linux does have it since 2.6.6. Your >statement is clearly outdated. > >>In real production environements, i currently have a serious >>problem with storage and minimizing storage requirements. i >>believe that with the current vdisk and dcss page stealing >>algorithms, that dcss will retain more real storage than vdisk. >>much more. and i think vdisk could be greatly improved upon. >Discussion with the VM development team indicates that things are >just the other way round. They believe DCSS would be more elegant >for their page stealing algos - unless I got them completely wrong. > "If you can't measure it, I'm Just NOT interested!"(tm) /************************************************************/ Barton Robinson - CBW Internet: [EMAIL PROTECTED] Velocity Software, Inc Mailing Address: 196-D Castro Street P.O. Box 390640 Mountain View, CA 94041 Mountain View, CA 94039-0640 VM Performance Hotline: 650-964-8867 Fax: 650-964-9012 Web Page: WWW.VELOCITY-SOFTWARE.COM /************************************************************/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
