ORA-27090: Unable to reserve kernel resources for asynchronous disk I/O

When check Oracle database alert log, we found message: ORA-27090: Unable to reserve kernel resources for asynchronous disk I/O

Cause
The core of this error is kernel limit parameter too slow. Example # cat /proc/sys/fs/aio-max-nr
65536 # cat /proc/sys/fs/aio-nr
65536 Solution:
We can increase aio-max-nr for resolver this error Example: Change kernel parameter: # sysctl -w fs.aio-max-nr=3145728 Check again: # cat /proc/sys/fs/aio-max-nr
3145728 If problem continues, we need to try configuration system parameter higher.