ora-27061 solution ?

1. disk_asynch_io=false,filesystemio_options=none or filesystemio_options=directio (Oracle init parameter)
2. _aiowait_timeouts = 250 (Oracle init parameter)
SQL>alter system set "_aiowait_timeouts" = 300 scope=spfile;
3. fs.aio-max-nr = 10485760 (/etc/sysctl.conf)