Redundancy of xMII ...

[Former Member]

Hi all,

Is xMII redundancy possible? , Just like redundancy in XI can be done using Cluster technology. Will that be possible for xMII.

Suppose there are some 10 xMII servers located at 10 different plant locations. For all those 10 xMII servers , Can one xMII server act as a backup?

[Former Member]

Thanks for all who have provided information regarding redundancy ...

[sufw]

Hi Vijaya,

with xMII 12.0, you will be able to leverage all of the high availability (clustering) functionality provided by NetWeaver. For version 11.5, I guess you will have to use a "hot standby" setup of something similar...

Sascha

[Former Member]

...and be careful in your application design. Be certain to avoid doing any I/O to the "real" file system, or else you'll lose your benefit(s) from clustering.

Also, you'll need to be careful how you handle IDOC destinations (ERP sending IDOCS to MII) in a clustered scenario where multiple servers are active. In fact, I'm not sure if anyone has tried this yet!

[salvatore_castro]

Rick,

I believe that the WebDispatcher will take care of the Message services routing to the Central and Dialog instances of NW (MII). I haven't tried it myself but will hopefully in the near future, still working on getting the HW. With that said it was tested by the QA dept.

Sam

[Former Member]

Hi, Sam.

I was referring to a "load balanced" scenario where multiple MII systems are active. Which one receives the message?

Rick

[salvatore_castro]

Rick,

Ok, the Load-Balanced configuration will work properly with the Message Listener interface...here's how the listener portion works:

1) Information sent to RFC destination in ERP

2) One of the multiple instances retrieves information

3) The instance that retrieved that information writes data to a Persistent JMS Queue (stored in DB)

4) One of the multiple instances will process the persisted information from the Queue

This does not guarante the serial processing of messages or any of the other Quality of Service (QoS) features that are provided by PI, formerly known as XI. It does however guarantee that one of the instances will capture and one will process the data in a High-Availability scenario.

Hope this helps.

Sam

[former_member193328]

Hi Rick

In 12.0 for RFC or IDoc messages if multiple xMII Systems are listening for messages from the same ERP system on the same port (RFC Destination) one of them will receive it. Which one we cannot tell for sure. This is done by the RFC gateway at runtime and xMII has no control on it.

Best regards

Partha