The lower limit is 3 and the current upper limit is 10. The maximum number of shared memory segments when using the AIX Large Memory Model is 8. The maximum number of shared memory segments when using the AIX Very Large Memory Model is 10.
Future releases of Domino may allow for a maximum of 11 shared memory segments.
Fixed in 7.0.2 FP1 release
notes.ini AIX_LIMIT_SHM_SEGMENTS helps to manage the memory usage of Domino running on AIX.
Use AIX_LIMIT_SHM_SEGMENTS to ensure the Domino instance has access to whole segments of shared memory. AIX memory segments have a maximum value of 256 Megabytes. The value used should be between 3 and 10.
The Domino server must be restarted after modifying this setting.
This setting applies only to the AIX operating system.
Domino 8 and higher versions now implement a lower, more effective limit to the size of the UBM in order to accommodate larger systems. Testing and performance data from the field indicates that a UBM limit of 512 MB is the optimum size limit on most platforms, allowing Domino to realize efficient disk I/O when accessing database structures on disk. Values higher than this have been found to result in increased memory usage without significant performance improvements.
The Domino 8 server enforces this limit by default with no additional notes.ini file parameters required. Domino will still honor the setting NSF_BUFFER_POOL_SIZE_MB (as well as related parameters) on upgraded servers, which can be used to configure the UBM to be larger than 512 MB if necessary. The default limits depend on platform, which are listed in the table below: