We currently do not change system id's. We do however have different IP addresses at DR now - that's fun. Don't know the network folks's latest plans. Always changing. They don't consider the impacts to the zVM and zOS support folks who have to make it work.
-----Original Message----- From: Linux on 390 Port [mailto:linux-...@vm.marist.edu] On Behalf Of O'Brien, Dennis L Sent: Friday, January 23, 2009 3:55 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: Z/Linux CKD DASD migration from one DASD Subsystem to another Alan Altmark wrote: >Convenience and Security are rarely bedfellows. Hopefully you use a >different system ID when you're in DR. Use it to qualify the >OFFLINE/ONLINE_AT_IPL so that you get the correct address range depending >whether you are at home or abroad. I've seen a number of posts, either here or on IBMVM, that suggest changing system ID's for DR. We don't do that. We have 18 VM systems. They're all somewhat different, or we wouldn't have that many. There is far too much node-dependent code to introduce additional node names for DR. If the code all belonged to the systems area, we might be able to manage it, but some of it is application code. E.g. Select When Wordpos(node,'NODE1 NODE2 NODEA NODEC') > 0 Then Do ... When node = 'NODE4' Then Do ... etc There are valid reasons for this type of code. Differences in the tape or DR environments, for example. These are hardware decisions over which we have no control. I can just imagine the havoc changing node names would have caused when we had OfficeVision. In the interest of making the DR environment look as much like production as possible for our users, we chose to keep the DR node names the same. That decision was made many years ago, and processes developed around it. Changing it now is off the table. Even if we just starting to design DR, I don't know if I'd go for changing node names. I know this is the Linux list. In a pure guest environment, this might be less of an issue. Some of our nodes have a CMS workload, where the VM node name definitely matters. Dennis O'Brien 39,650 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ************************************************************ This communication, including attachments, is for the exclusive use of addressee and may contain proprietary, confidential and/or privileged information. If you are not the intended recipient, any use, copying, disclosure, dissemination or distribution is strictly prohibited. If you are not the intended recipient, please notify the sender immediately by return e-mail, delete this communication and destroy all copies. ************************************************************ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
