On Wed, 18 Oct 2023 08:45:52 +1300, Laurence Chiu <lch...@gmail.com> wrote:
>That is exactly the situation, The second LPAR will be on the same CEC as >the first, share OSA adapters and be in a sysplex with XCF being the >mechanism to share the VIPA information. Since I've never seen an OSA, I must assume that OSA has smart router capabilities and that it's configured correctly. If that's correct, then don't discuss DVIPA with the network people because it's not important to them. I assume that TCP will communicate any router changes needed for DVIPA directly to the OSA or it is using OMPROUTE to make those changes. That's up to you to figure out. >The second LPAR will be in the same subset as the first. Subnet doesn't play a role for DVIPA. Anything we derive from it is an assumption which can be false. For instance, if the subnet is full, then your DVIPA address won't be in that subnet without reorganizing the subnet. There is no requirement that it be in the same subnet. > From my reading of the docs, when >the server application on the primary LPAR is shutdown, and an incoming >transaction arrives for it, TCP on the second LPAR will see the >primary host and dynamically route the transaction to the server on the >second LPAR. By making it dynamic we don't hae to worry about automation >moving the VIPA, we can let TCP do that. John Gitner very wisely told you "figure out what needs to be done, or not done". You are at the point that you need to understand DVIPA details. There is more than 1 way to solve most problems. DVIPA can solve many problems but not everything. You must review DVIPA configuration to determine how you will use it to solve your problem. Some things you might want to consider. 1. Are you going to use DVIPA ownership with move or as Art hinted at using workload balance? 2. Will you use DVIPA port protection or have the network people setup a firewall? 3. Can DVIPA detect when you move your app or must you notify DVIPA when the app is moved? About the DVIPA address you need from your network people, I assume the internet data will use existing company assigned addresses but use NAT to convert the ports to your IP address / ports. Do you require the intranet port to be the same as the internet port? You need a static IP address from your network people. This IP address destination will be the OSA NIC's used for both LPARs. Hopefully they are the same NICs. They need to know if you need a firewall or if DVIPA will protect connections. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
