S-Series systems are not configured with the number of processors expected in the system. From a system configuration perspective, the operating system is always ready to accept (software wise) a maximum of 16 processors.
MOMI, every time is it started, uses the numerically highest 'up' processor in the system as the number of processors for up/down determination. For example, if the numerically highest 'up' processor is 5, which indicates 6 CPUs numbered 0 through 5, and processor 4 crashes, processor 4 is reported as down.
Additional processors added to the system while MOMI is operating automatically increase the numerically highest 'up' processor determination. In the above example, if an additional two processors were added, processors 6 and 7, MOMI now assumes the system is 8 processors numbered 0 through 7.
If processors are removed from the system 'on-line', i.e. without a cold-load, restart MOMI to force a new up/down calculation.