IAR005E PREFERRED AREA HAS EXPANDED, RECONFIGURABILITY AND PERFORMANCE MAY BE IMPAIRED. text.
Explanation
The real storage manager (RSM) converted one or more non-preferred frames or 1 MB frames to preferred frames. The system may no longer be able to reconfigure all or part of the storage in the non-preferred area. If this expansion involves frames below 16 megabytes, the system can page fix these frames, which might lead to performance problems.
- CHECK RSU VALUE
- When running in z/Architecture® mode with a specified RSU of 0, there are still areas of real storage being managed as preferred and non-preferred storage. Specifically, there is a class of real storage frames managed in a special way called quad frames. These frames are used primarily to hold segment tables and must be 4 contiguous frames of real storage. The area occupied by quad frames is treated as non-preferred storage. During times of heavy demand for real storage, frames from the area used by quad frames may be required for system overhead and will be reallocated for system use for the duration of the IPL. In this case, message IAR005E is issued.
- POSSIBLY DUE TO RECOVERY IN PROGRESS
- During recovery processing for the RSM, some available frames might appear to be not available to the system. This condition is temporary and will be cleared when the recovery processing completes.
System action
The system can use the newly designated frames as preferred storage for additional long term resident pages.
Operator response
Enter a DISPLAY M command to determine the number of frames remaining in the non-preferred area.
System programmer response
Check that the reconfigurable storage unit (RSU) value specified in the IEASYSxx parmlib member is appropriate for your installation. See z/OS MVS Initialization and Tuning Reference for more information about the IEASYSxx parmlib member.
If the message indicates that recovery processing is in progress and the RSU value is appropriate, then no further action is required. Additional frames will become available as the recovery processing completes.
Source
Real storage manager (RSM)
Module
IARUC, IAXUC
Routing code
1
Descriptor code
11