Load Balancing & RFC Server Groups

You changed a logon group and want to confirm the new distribution immediately, but SMLG still shows the old picture. Why, and what do you do?

A colleague says configuring SAP GUI to a logon group means the GUI tests the instances and connects to the least-loaded one. What is wrong with that, and why does the correction matter for maintenance?

Parallel-processing batch jobs are overwhelming online dialog users, but interactive logons are still spread evenly. Do you tune SMLG or RZ12, and why that one?

Two instances in a logon group have nearly identical user counts but one has much worse dialog response time. Under the B (best performance) method, which gets new logons, and is that obvious from the defaults?

A developer assumes async RFC mass-parallel jobs run in background work processes so they can't hurt online users. Why is that assumption dangerous, and what protects the users?

FavTyp offers B, R, and W for how the message server picks a logon group's favorite instance. Which is recommended and why would picking R or W bite you?

You're creating an RFC server group assignment in RZ12 on a fresh system. The dialog asks about applying quotas — what's the easy-to-skip answer, and what two groups will you already see?

In a multi-instance system, what concretely goes wrong if users connect SAP GUI to a specific instance's dispatcher port (32XX) instead of a logon group?

Why would you deliberately split users into separate logon groups like FINANCE and SALES instead of one PUBLIC group with everything, and what flexibility do you keep regardless?

On a multi-instance system where no one has defined any logon group in SMLG, is dialog load balanced or not?

A program needs its async RFC work spread across several instances rather than pinned to one. What construct does it use, and what is the discriminating keyword in the ABAP call?

In RZ12 the three async-RFC quotas default to 90, 25, and 75 percent. What scope does each apply to, and which is the per-caller limit that surprises people?