Network Hardware User Manual

348 U3585-J-Z125-8-76
Special applications (VM2000) Notes on SM2 operation
Note
The corresponding values can also be output by using the VM2000 command SHOW-
VM-STATUS (see the “VM2000” manual [9]).
VM2000 operation on /390 architecture
The overall CPU utilization is determined by taking the HYPERVISOR-IDLE value and
extrapolating the difference to 100%.
The IDLE value given by the SM2 monitoring program loses its original meaning, in which
case it merely acts as an indicator of the percentage for a given time period, one during
which the respective guest system was inactive of its own volition.
Example: 2 guest systems, VM1 and VM2
Each guest system is to be active for 50 s within the time period of 100 s.
– Ideal situation: No idling occurs
– Realistic case: idling does occur for half of the required active period (***)
The SM2 idle value of 33% is explained by the fact that SM2 precisely monitors the active
time (50 s), adds the voluntary inactive time (reduced to 25 s as the result of idling), and
relativizes it to 100%.
VM1 SM2-Idle=50 %
Hypervisor-Idle=0 %
VM2 SM2-Idle=50 %
VM1 ***** SM2-Idle=33 %
Hypervisor-Idle=0 %
VM2 ***** SM2-Idle=33 %