LFAREA calculation example 5

In comparison to Table 1, Table 1 also shows a series of LFAREA requests on a system with 64 GB of online real storage at IPL. The 1 MB pages are again requested with target and minimum percentages of 40% and 20%, respectively. The 2 GB pages, however, are requested as minimum and target numerical values that are increased with each request. This example illustrates how the 1 MB pages are again reduced toward the minimum to satisfy the target number of 2 GB pages, but when the 1 MB minimum cannot be reduced further, the 2 GB request is reduced toward its minimum. As shown in Table 1, when the number of 2 GB pages reaches 19, the required reduction in 1 MB pages is below the requested minimum. At this point, the 2 GB request is reduced to 18, which is still above its minimum. When the 2 GB request reaches 21, it can no longer be satisfied by reducing either the 1 MB request or the 2 GB request, because either reduction would be below the requested minimum. At this point, a prompt to re-specify LFAREA is issued. Note also that this example illustrates how the system prioritizes the 2 GB request over the 1 MB request, provided that the request can be satisfied at or above the requested minimum.