Performance degradation may be seen in Database

Hello,My database return this warning  and database Performance  is  impacted


Redo thread mounted by this instance: 1
Oracle process number: 5
Unix process pid: 1151042, image: oracle@mangory (CKPT)

*** 2012-08-20 04:43:10.264
*** SESSION ID:(4.1) 2012-08-20 04:43:10.203
Warning: lio_listio returned EAGAIN
Performance degradation may be seen.
*** 2012-08-21 23:37:42.090
Warning: lio_listio returned EAGAIN
Performance degradation may be seen.
*** 2012-08-22 04:40:39.987
Warning: lio_listio returned EAGAIN
Performance degradation may be seen.


OS= AIX 5.3
Oracle database 10.2.0.4

Thanks for your  help.
Regards,
Jeannot