IAR042I   LFAREA=(specification) WAS SPECIFIED WHICH RESULTS IN A REQUEST FOR ZERO 1 MB AND ZERO 2 GB PAGES.

Explanation

The LFAREA parameter specified a nonzero percentage, which resulted in a request for zero 1 MB and zero 2 GB pages. This can occur if the specified percentage is small, or if there is a small or insufficient amount of available online storage. If xM, xG, xT, or x% syntax is specified, a percentage request is calculated by first multiplying the percentage by the online real storage, and then subtracting 2G: (percentage * online real storage) – 2G. However, if 1M= or 2G= syntax is specified, a percentage request is calculated by first subtracting 4G from the online real storage, and then multiplying that by the percentage: (online real storage – 4G) * percentage. The result is then rounded down to the nearest respective 1 MB or 2 GB page boundary, which could result in a zero value.

For example, on a 13G system, a request for LFAREA=(2G=10%) is calculated as 0.10 * (13G – 4G) = 0.9G, which rounded down to the nearest 2G page boundary becomes zero. In this example, a request for at least 23% is required to reserve at least one page, which is calculated as 0.23 * (13G – 4G) = 2.07G which is then rounded down to 2G. This message is issued when either a nonzero target percentage or a nonzero minimum percentage results in a request for zero target or zero minimum pages.

System action

The system issues message IAR045I for each area with the amount of available storage and the minimum percentage required for at least one page. In addition, the system responds as follows if a nonzero percentage results in a request for zero pages because of insufficient storage:
  • If xM, xG, xT, or x% syntax was specified, the system reserves zero 1 MB and zero 2G= pages and continues the IPL.
  • If 1M= or 2G= syntax was specified:
    • If PROMPT was specified, either explicitly or by default, the system prompts for reentry of the LFAREA parameter.
    • If NOPROMPT was specified, the LFAREA specification is ignored and zero 1 MB or 2 GB pages are reserved in the large frame area and IPL continues.

Operator response

Ensure that the correct IEASYSxx member is used for this IPL. If the correct IEASYSxx member is used, but sufficient storage is not available, contact your system programmer.

System programmer response

If 1 MB or 2 GB pages are required, ensure that enough storage is installed for the z/OS® image and that the requested percentage is large enough to reserve the intended number of pages.

Source

Real storage manager (RSM)

Module

IAXMT

Routing code

1

Descriptor code

12

Parent topic: IAR messages