Seperate SAP-Net for TCP/IP Traffic between LPARs ?
I want to make a seperate IP-Net on a seperate ethernet-interface for the IP Traffic between the LPARs to give more bandwidth to the IP-connections.
Normal you have a extra server IP-segment, for example 10.10.10.xx. This IPs will be routed to the gateway and to the clients. If you have an application-server in front of the iSeries, you will have an seperate IP-net 10.10.11.xx, which is layed on a seperate ethernet-interface, so that you can be shure the the IP-traffic is not going over the ethernet interface, which is used to serve the SAP GUI clients.
Our idea is to make a special IP-net for the LPARs itself. For the traffic which is going from R3-LPAR to BW-LPAR or GTS-LPAR. We would like to set this IP-net (for example 10.10.12.xxx) on seperate ethernet-addapters, which are connected to a dedicated switch. For this we probably need to configure some sm59 entries new and perhaps some other things too.
So my main questions are:
Is this a good idea?
Is the performance really improved?
Do we have after doing this more problems with other things?
Is there anyone out who has tried this before?
The virtual ethernet is provided as a special feature of LPAR which allows the kind of communication that I noted.
IBM has information on the features of virtual ethernet and what you need to do:
<a href="http://publib.boulder.ibm.com/infocenter/systems/scope/hw/index.jsp?topic=/iphat/iphatvirtualetherneti5os.htm">Virtual Ethernet for i5/OS logical partitions</a>
<a href="http://publib.boulder.ibm.com/infocenter/systems/scope/hw/index.jsp?topic=/iphat/iphblconfigvirtethp6.htm">Configuring a virtual Ethernet adapter using version 7 or later of the HMC</a>
<a href="http://publib.boulder.ibm.com/infocenter/systems/scope/hw/index.jsp?topic=/iphbk/iphblconfigvirteth.htm">Configuring a virtual Ethernet adapter using version 6 or earlier of the HMC</a>
You create a virtual ethernet resource using the HMC, and this is what is used for the connection. It is by virtue of using a virtual ethernet adapter, instead of a hardware adapter, that you get the 1G speed and the peer-to-peer nature of the connection, requiring no external router.
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