Solaris+oracle 11g warning:aiowait timed out 1 times

Recently to the database to do patrol, always found warning:aiowait timed out 1 times error, the following alert content:

Thread 1 cannot allocate new log, sequence 52198

Private Strand Flush Not complete

Current log# 5 seq# 52197 mem# 0:/oradb/adc/sysfile/redo05.log

Thread 1 advanced to log sequence 52198 (LGWR switch)

Current log# 6 seq# 52198 mem# 0:/oradb/adc/sysfile/redo06.log

Thu APR 14 05:01:29 2016

Warning:aiowait timed out 1 times

Thu APR 14 05:02:03 2016

Warning:aiowait timed out 1 times

Thu APR 14 05:02:45 2016

Warning:aiowait timed out 1 times

Thu APR 14 05:03:16 2016

MINACT-SCN:USEG Scan erroring out with error e:12751

Thu APR 14 05:03:35 2016

Warning:aiowait timed out 1 times

Thu APR 14 05:05:16 2016

Warning:aiowait timed out 1 times

Thu APR 14 05:07:34 2016

Warning:aiowait timed out 1 times

Thu APR 14 05:07:34 2016

Warning:aiowait timed out 1 times

Thu APR 14 05:07:34 2016

Warning:aiowait timed out 1 times

Thu APR 14 05:07:34 2016

Warning:aiowait timed out 1 times

Thu APR 14 05:07:34 2016

Warning:aiowait timed out 1 times

Thu APR 14 05:07:35 2016

Warning:aiowait timed out 1 times

Thu APR 14 05:10:16 2016

Thread 1 cannot allocate new log, sequence 52199

is the Data warehouse system, the time is running batch process, I suspect is the Solaris asynchronous IO problem, is communicating with the manufacturer, there is no feedback.

--20160401

Changed the Disk_asynch_io, changed from true to False, no error, but the ETL is particularly slow, and changed back to true;

--20160414

Changed the db_writer_processes, changed from 20 to 28, observe the effect tonight;

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Solaris+oracle 11g warning:aiowait timed out 1 times