I would test those router changes. It's not as simple as it sounds. And test on a quarterly basis. How do you plan on having "zero" downtime while all your routers are being updated? And you're waiting the x number of hours for the internet to flush stuff through for your external sites?

Here all the stuff that external people get to, like our websites and file sites, goes through an IBM Edge server which checks availability of the endpoints and routes accordingly. So when we bring down our production web server the edge server routes automatically to the backup one.

Internally, our production and backup systems have different IP addresses. We actually have a line in the switch program which communicates to our Windows DNS server and changes the IP address for our production server to the backup server. Tested quarterly and just did it this weekend. Granted any 5250 session dies and comes back to life on the new system but we always do our switch at the same time on Saturday morning and the switch back at the same time Sunday evening.

Oh, and yes, IBM's license key's are keyed to system values QSRLNBR and QMODEL. See the command WRKSYSVAL. However, as someone else pointed out you can load multiple values into WRKLICINF. Some applications, however, do not use WRKLICINF and store the keys in the application data file libraries themselves. Infor LX does. I'm sure other software does also. And these are most definitely tied to QSRLNBR, QMODEL and often stuff only available via certain API's like number of processors allocated to that lpar or all lpars of IBM i on that system.

Rob Berendt

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