Report "IOs for device classes" 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”.