McKown, John wrote:
We have two OSAs on our z/OS 1.4 system. The are running in QDIO mode. I
remember in the past that __something__ happened and one of the OSAs
"died". But I don't remember how. I don't remember if it was the OSA
itself that had a problem or if the switch to which it was connected had
a problem. My question is: What causes one OSA to "take over" for a
second OSA? As I recall, when this happened, no TN3270E sessions were
disrupted at all.
I ask because our network people need to do some maintenance to one of
the switches which "feeds" one of the OSAs. I'm wondering if the other
OSA will automatically take over the first OSA's session, resulting in
no outage of service.
Thanks - I cannot find an OSA manual, so a pointer to one would be nice
also.
--
John McKown
Senior Systems Programmer
UICI Insurance Center
Information Technology
There is nothing that I am aware of that would cause an OSA to take over
for another one at the hardware level.
What they may have setup is dynamic routing. If you have TN3270 on a
VIPA, each OSA in it's own subnet connected to a router ("router"
includes layer 3 switches like a Cisco 6500 with needed cards) then when
one OSA failed, the dynamic router code (OMPROUTE) will notify all other
routers to send traffic via another path. I would assume they would use
OSPF.
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