NonStop Systems are not configured with the expected number of processors. 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 as the expected 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 an extended period of time, add to the CONFMOMI file the keyword CPU-NOT-PRESENT and restart MOMI. This keyword directs MOMI to treat the indicated CPUS as not present in the system (i.e. they are not flagged as DOWN). Be sure and remove this keyword when the system configuration is restored to normal.