This is really strange! We have a z9 with 4 MVS lpars and a VM lpar and a couple of Linux guest. There is a hipersocket link between 2 of the MVS lpars, VM and the Linux guest. There is also a vswitch running layer 3. The MVS lpars have 2 dedicated OSAs and the VM lpar has 2 different dedicated OSAs. A couple of days ago when I detached the vswitch in order to rebuild it for layer 2 we lost connectivity with the 2 MVS lpars that have a hipersocket connection. Since the Linux guest were down, I IPLed VM and connectivity to the MVS lpars came back. I've repeated this 2 more times (off hours) with the same results. Seems destroying the vswitch is causing a problem. A dump of TCP on the MVS lpars doesn't show any problems.
I'm open to any suggestions. I have test time this weekend but I'm not sure what to try. Bobby Bauer Center for Information Technology National Institutes of Health Bethesda, MD 20892-5628 301-594-7474
