NonStop Systems are not configured with the number of processors expected. From a system configuration perspective, the operating system is always ready to accept (software wise) a maximum of 16 processors.
Every time MOMI is started it uses the numerically highest up processor in the system to determine the number of processors in the system. For example, if the numerically highest up processor is 5, which indicates 6 CPUs (0 through 5), and processor 4 crashes it 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 recompute a new up/down calculation.
If processors are removed from the system, for example CPUs 4 & 5 in a 6 processors system, and it is necessary to operate in that manner for a period of time, add the CONFMOMI keyword CPU-NOT-PRESENT and restart MOMI. This keyword indicates which CPUs are expected to be down. Be sure and remove this keyword when the system configuration is restored to normal.