<number> of <number_of> read ahead requests could not be fulfilled, configured number of parallel requests (MaxDataAreaReadAheadRequests): <number>
To improve I/O performance a read ahead (prefetch) mechanism is provided allowing the parallel import of data pages from the disks to the cache. If a high number of request could not be fulfilled this will impact the overall I/O performance.
If there is a high failing rate check the task configuration in the system, especially the distribution of server tasks.
Check the disk performance.
Relevant DB-Analyzer Files
Helpful with ...
|1327874 - FAQ: SAP MaxDB Read Ahead/Prefetch||Provides information about the different prefetch mechanisms.|
|1672994 - SAP MaxDB: Configuration of server tasks|
Content / Helpful with ...
|Session 29: SAP MaxDB: Improvements in I/O Handling 7.9 and Prefetch Mechanisms||Provides general information about the different concepts of prefetch mechanisms.|