Parameters for tuning asynchronous I/O
- minservers The minimum number of aioservers that are started for asynchronous disk I/O. The default value is 1
- maxservers The maximum number of aioservers that are started for asynchronous disk I/O. The default value is 10. Since each aioserver uses memory, this number should not be much larger than the
expected amount of simultaneous asynchronous disk I/O requests
- maxreqs Maximum number of asynchronous disk I/O requests that can be stored in the queue. The default value is 4096
Tuning Recommendations
- minserver : 2 or Number of CPUs -1, whatever is larger
- maxserver : Two times the number of datafiles
- maxreqs : 12288
- for large systems the number of aioserver processes may become very large and the maximum number of processes per user has to be adopted
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