11gR2数据库发现aler log中有报错：ORA-27090 async io

ORA-27090 - Unable to Reserve Kernel Resources for Asynchronous Disk I/O (文档 ID 579108.1)

SOLUTION
The "aio-max-nr" kernel limit should be adjusted according to Oracle recommendations which are available in this document: 

Oracle Validated Configuration:
http://linux.oracle.com/pls/apex/f?p=102:2:2007385298933639::NO::P2_VC_ID:426

Also, this parameter should be set as follows:
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fs.aio-max-nr= 3145728

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