z/OS can do load balancing if you have mutiple equal cost routes defined, one
route for each OSA and I think they could be the same route, something like:
BeginRoutes
route default = OSA_INTERFACE1
route default = OSA_INTERFACE2
ENDRoutes
You could use either default, or code routes for specific hosts/subnets. Using
default will load balance all outbound traffic, coding more specific routes
will just load blance the traffic for hosts matching those routes.
You then add add one of the following statements to your IPCONFIG statement.
MULTIPATH PERCONNECTION
MULTIPATH PERPACKET
First one will have z/OS alternate which route it takes per TCP connection.
Connection request #1 get path/route #1, request #2 gets path/route #2.
Depending on timing all 3 jobs could still get sent out the same OSA, but you
will be using both OSA's so it won't impact all traffic.
Second one does the same thing, but per packet. More overhead but both OSA's
will be used "equally".
No matter what you do, depending on your network setup either one of these or,
as Keith suggested, defining a ROUTE via a specific Interface you could
overload your network. If your whole infrastructure is 1 Gbps Ethernet, your
z/OS system can now push ~2 Gbps through the network.
On Thu, 25 May 2023 19:37:10 +0100, Keith Gooding <[email protected]> wrote:
>Hi Rex
>
>Networking is not my speciality but you should be able to add a HOST route -
>see the BEGINROUTES statement in IP Config Reference. Something like this:
>
>ROUTE windows server IP address. HOST = OSA_INTERFACE2
>
>where OSA_INTERFACE2 is the interface which you want to use.
>
>This example assumes that the server is on the same subnet as the adapter -
>change - to the router IP address if not.
>
>No guarantees.
>
>Keith Gooding
>
>Sent from my iPad
>
>> On 25 May 2023, at 16:41, Pommier, Rex <[email protected]> wrote:
>>
>> Hi all,
>>
>> I have a question about routing FTP traffic. First a bit about the
>> environment. Z14-zr1 with (2) 1-GbE OSA adapters shared across 3 LPARs.
>> The 2 adapters are not in a VIPA configuration. Right now on this LPAR,
>> only 1 of the adapters is defined to TCP/IP. I can easily get the second
>> OSA configured into TCP/IP on the LPAR so that's not an issue.
>>
>> The situation/question. I have 3 jobs that run on the mainframe that all 3
>> initiate an FTP process to Windows servers. Between the 3 jobs they are
>> pushing between 1.5 and 2 terabytes to the servers. The jobs are currently
>> single threaded and from looking at the FTP output, they are pushing the
>> Ethernet adapter that is in use at 100%. My question is this: If I
>> configure the second adapter, is there a way that I can force one of these
>> jobs to use one of the OSA adapters and the other 2 to go to the second
>> adapter? From what I recall, z/OS doesn't do any kind of trunking or load
>> balancing so setting up a VIPA won't improve throughput by using both
>> adapters. I've meandered through the IP configuration reference and see
>> nothing that would give me this capability.
>>
>> TIA
>>
>> Rex
>>
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