Report "IO" of the report group IO

This report should be assessed in conjunction with the report “Utilization real” of the report group CPU. Certain loads are both compute-intensive and have a high number of I/O operations. Consequently, the most important criterion is that the channels and volumes are not overloaded. The standard values for the maximum number of DMS I/O operations per second are determined in accordance with the rule that (depending on the speed of the system) only 15 to 25% (/390 servers) or 8 to 12% (x86 servers) of the CPU capacity in processor states SIH+TPR should be used for processing the I/O operations. In certain situations it is feasible to exceed this limit.

See also section “Standard values for BS2000 servers”.