If you look up the EVMS manual and the FAQ on their website they give indication that if you want to do multipath on root filesystem you have to change things in startup in order to get it to work, they have scripts and workarounds for i386 platform and some others, but not s390. I was going to look at that and see if i could hack it for s390 and share with you all. I'll probobly not work on it until 11/7/04 or 11/8/04 when im back into work. -Cameron Seader 208-395-8228 [EMAIL PROTECTED]
-----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of Robert J Brenneman Sent: Wednesday, November 03, 2004 8:09 AM To: [EMAIL PROTECTED] Subject: Re: Best Practices EVMS FCP Multipathing Yes - you definately want multipathing for I/O intensive things like databases. At the moment this is usually only done with things like /home or /opt since thats what the installers support. The installers dont really support complex root volumes at the moment, but setting up a multipathed root could probably be done the hard way: Install a SLES-9 system on a single path standard SCSI LUN. configure a multipath EVMS LUN to that system at /mnt copy the entire file system to the EVMS LUN chroot into the multipathed LUN and do some config file editing, mkinitrd, zipl, etc. I think that as long as the initrd contains the EMVS multipath modules, and that you always IPL through the same path it should work. I'll test this theory and let ya'll know how it goes. Jay Brenneman Linux Test and Integration Center T/L: 295 - 7745 Extern: 845 - 435 - 7745 [EMAIL PROTECTED] Martin Peschke3 <[EMAIL PROTECTED] COM> To Sent by: Linux on [EMAIL PROTECTED] 390 Port cc <[EMAIL PROTECTED] IST.EDU> Subject Re: Best Practices EVMS FCP Multipathing 02/11/2004 04:30 PM Please respond to Linux on 390 Port Cameron, yes, I have tried to install SLES9 on a multipathed SCSI disk: it all wound up in disaster. There are no clear directions when one tries to achieve that using YaST (there is md, LVM, and EVMS), not to mention scarce documentation. I finally managed to create some multipathing configuration using md, that didn't look too insane to me. I clicked 'ok' when a YaST message appeared that warned me that my multipath setup might not come up during IPL in some cases. Then the installation crashed (oops in md?). My personal conclusion is: no, multipathed boot devices are not supported. Though it might be worth trying to setup a multipathed root device, using a miniature (non-multipathed) boot device. For the rest, I agree with Carsten. Mit freundlichen Gr��en / with kind regards Martin Peschke IBM Deutschland Entwicklung GmbH Linux for zSeries Development Phone: +49-(0)7031-16-2349 Carsten Otte To: Linux on 390 Port <[EMAIL PROTECTED]> 02/11/2004 20:57 cc: Stefan Bader/Germany/[EMAIL PROTECTED], Martin Peschke3/Germany/[EMAIL PROTECTED] From: Carsten Otte/Germany/[EMAIL PROTECTED] Subject: Re: Best Practices EVMS FCP Multipathing(Document link: Martin Peschke3) Hi Cameron, you definetly want to do multipathing with FCP. Unlike with FICON, your adapter (and your physical fibre) will be a single point of failure if you don't. In order to maximize performance, you can combine multipathing with raid0 striping to gain further. with kind regards Carsten Otte -- omnis enim res, quae dando non deficit, dum habetur et non datur, nondum habetur, quomodo habenda est "Seader, Cameron" <[EMAIL PROTECTED] To: [EMAIL PROTECTED] er.com> cc: Sent by: Linux on Subject: Best Practices EVMS FCP Multipathing 390 Port <[EMAIL PROTECTED] IST.EDU> 02/11/2004 01:40 AM Please respond to Linux on 390 Port Greetings, Just a few Questions reguarding FCP Multipathing. I have installed multiple systems with a 5 GB LUN for the / system and am wondering if it is a good idea to define this with multipathing, or is it better to add more disks to the mix and multipath those that are only used for say databases and such? What is the best practice for this. Is it a good idea to have multipathing on your root volume or not? Novell does not seem to know either. They are hinting at the idea a bit that there would be more problems if you had the root volume setup with multipathing. Any ideas? What do you think? Has anyone had any experiences with this that they would like to share? -Cameron Seader This transmission may contain information that is privileged, confidential and/or exempt from disclosure under applicable law. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution, or use of the information contained herein (including any reliance thereon) is STRICTLY PROHIBITED. If you received this transmission in error, please immediately contact the sender and destroy the material in its entirety, whether in electronic or hard copy format. Thank you. 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