This message is issued after an error is detected in the LFAREA specification. This message is issued three times:

1. Once for 1 MB pages using xM, xG, xT, or x% syntax.
2. Once for 1 MB pages using 1M= syntax.
3. Once for 2 GB pages using 2G= syntax.

The message describes the valid values or ranges that can be specified for the 1 MB and 2 GB pages, and the minimum percentage that must be specified to reserve at least one 1 MB or one 2 GB page. The values indicate the amounts that can be specified as if only 1 MB pages or only 2 GB pages will be requested; when both 1 MB and 2 GB pages are requested, the sum of the requested amounts must not exceed the system limit.

If the xM, xG, xT, or x% syntax is used, the system limit is calculated by first taking 80% of the online real storage at IPL, and then subtracting 2G: (80% * online real storage at IPL) - 2G. If the 1M= and 2G= syntax is used, the system limit is calculated by first subtracting 4G from the online real storage at IPL, and then multiplying that by 80%: (online real storage at IPL – 4GB) * 80%. Message IAR043I is issued if the requested amount is greater than the system limit.

The range of percentages is included to reflect the valid range of pages, but there can be percentage values within the range that are between pages or less than a full page. Percentage requests are rounded down to the nearest 1 MB or 2 GB page boundary, which results in a request for zero pages if the calculation is less than one page. The minimum percentage required to reserve at least one page is provided in this message. Message IAR042I is issued if the requested percentage is not enough to reserve at least one page.

A valid value of zero is indicated when the required hardware support is not available, or when there is not enough storage available for the large frame area, which is typically a result of fragmentation caused by offline storage.