How To handle Backlog and Overload in XI/PI Systems

SAP has revised it's document on How To handle Backlog and Overload in XI/PI Systems and published it a few days ago. You can download version 2 of the document from Note 1045751.
It's a handy document and it can teach you more about how XI works.

Correct procedure to Stop/Start your XI system

The SAP Technical Operations Manual does not provide clear details on all the steps involved in stopping/starting your XI system. Now SAP released the details in Note 870864 and have updated the Technical Operations Manual with all the steps.

RFC load balancing procedure 'Weighted Round Robin'

With Basis 7.00 Support Pack 15 SAP will release a new Weighted Round Robin load balancing procedure for RFC connections to your ABAP backend systems. This will ensure that load is distributed to ABAP servers based on their performance and not on a purely round robin method.. But you don't have to wait for Support Pack 15. You can also implement it as an advanced correction. See Note 1112104