Showing my ignorance, but the logic I use is that 31bit apps can run in either a 31 bit OS or a 64 bit OS. Unless the application is doing something specific and detecting that it has reached the 31 bit line, do you really have to worry?
-----Original Message----- From: Cortes, Marcy D. [mailto:[EMAIL PROTECTED] Sent: Wednesday, March 30, 2005 9:33 AM To: [email protected] Subject: Re: zLinux 31 to 64 bit We will move the sles 7 to sles 9's very soon. I don't see a need to convert the 31bit to 64 bit unless they are storage constrained. Seems like if there weren't it would probably just be adding overhead; let's let one of the performance experts weigh in on that. Some of our app developers may want to move from sles 8 to sles 9 for later levels of things like compilers, autoconf, tomcat, etc. They will probably just want another server and migrate off the old one themselves. I don't forsee upgrading many of the sles 8 to sles 9. As new ones come on, we'll look at if they can run on 9 then put them there. Just need more time to do all this! If I had unlimited resources and time, they might all get upgraded to 9. Marcy Cortes "This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose, or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation." -----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Tom Duerbusch Sent: Wednesday, March 30, 2005 9:22 AM To: [email protected] Subject: Re: [LINUX-390] zLinux 31 to 64 bit Well, I've read the manual, and basically, the only question that I asked that it answered was that to use 64 bit Sles9, you have to do a new install. But considering the lack of response from others, it kind of leads me to believe that anyone that is going to Sles9 and has earlier releases of Suse, are not migrating their applications to the next release. No matter what, I'll convert the Sles7 images to Sles9. The question is why or why not would someone convert Sles8 images to Sles9 and whether to convert Sles9 31 bit to Sles9 64 bit. So, is it a given that everyone should do the conversion? Or that you shouldn't do the conversion? That is given, that is it not a problem from the application side to do the conversion? Tom Duerbusch THD Consulting >>> [EMAIL PROTECTED] 03/29/05 12:28 PM >>> Some answers to your questions are in a "Linux 2.4 to 2.6 Transition Guide" PDF mentioned in today's posting by Jim Sibley: " Linux on zSeries page http://www-1.ibm.com/servers/eserver/zseries/os/linux/index.html There are more and more links to whitepapers, tips and hints, redbooks (and of course, marketing stuff). An interesting white paper is available there dated this month (March,2005): Linux 2.4 to 2.6 Transition Guide. Jim Sibley" -----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Tom Duerbusch Sent: Tuesday, March 29, 2005 1:25 PM To: [email protected] Subject: zLinux 31 to 64 bit Soon, we will have a z/890 and I need to make, at least, some of my Linux images, 64 bit. At that point, we will be on z/VM 5.1. 1. At this point, I don't really have a problem with just reinstalling Sles9 in order to get 64 bit. However, is there a way to migrate or toggle 64 bit mode in a Sles9 image installed on a 31 bit system? 2. I have some Sles7 and Sles8 images that I was thinking of reinstalling as Sles9 images. They don't need 64 bit capabilities. Is there a reason to install Sles9 as 31 bit when you have a 64 bit environment? Is there a performance hit on 64 bit vs 31 bit? Can you install a 31 bit Suse9 when in a 64 bit environment? 3. Sles9 seems to take more resources with the default install then Sles8 and Sles7. A Sles9 31 bit image would use swap space when booting with 32MBs, vs Sles7 and Sles8 never used swap during boot even in a 24MB machine. Others have indicated that Sles9 seems to take more CPU when idling. It seems to me that there are more services running by default in Sles9 that need to be looked at and/or shutdown. Getting off of Sles7 is a given. Too old and I don't want to have the administraction overhead of supporting every Suse version<G>. But what are others feeling of having mixed release levels of Suse, given an environment where you don't have to. i.e. it is easy to migrate Sles8 to Sles9? 1. Why bother? 2. Yea, I'll get to it later? 3. Bite the bullet and stop supporting mixed environments? 4. Wish we could do it? 5. Don't, stop! The additional resources is a concern? 6. I don't like change? (hey, I still have my VM/ESA 370 mode packs spinning...don't ask) 7. We migrate when we need to. 8. The release dies when the application dies (or a new release needs to be installed). Any other migration issues sites on Sles9 have? Thanks Tom Duerbusch THD Consulting ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- 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
