The specific numbers of 1 MB pages and 2 GB pages that your system requires depend on multiple factors. One factor is the number of 1 MB pages and 2 GB pages that exploiting applications require for various workloads to gain a performance benefit. The following LFAREA specification examples illustrate how various amounts of online storage at IPL affect the resulting number of 1 MB and 2 GB pages.

Table 1 and Table 2 illustrate a simplified approach, using a LFAREA percentage specification, that works for any amount of online real storage without operator intervention. The specified minimum percentage of 0% allows the system to continue the IPL after reserving as many 1 MB and 2 GB pages as possible, up to the specified target percentages. For these examples, some number of 1 MB pages will always be reserved in the large frame area when the online real storage at IPL is above 4 GB. However, 2 GB pages are reserved only when the amount of online real storage at IPL is sufficiently large. Note that Table 2 doubles the requested percentage, which provides a similar number of 1 MB and 2 GB pages at lower amounts of online storage.