Warning: Aiowait Timed Out 1 Times Database Not Responding Cannot kill processes

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Problem: Warning: Aiowait Timed Out 1 Times Database Not Responding Cannot kill processes





Symptoms:
The database/instance is stopped.

You have Oracle processes still listed as running.

You have an error and/or trace files containing: 'WARNING: AIOWAIT TIMED OUT'

You attempt to kill the process via a terminal session and cannot.

kill -9
kill -15

None of the kill signals work.

Other symptoms that may indicate you are encountering this issue may be revealed in trace files containing syntax similar to:

Killing process (ospid 1567): (reason=x4 error=0)
... and the process is still alive after kill!



Solution:



The issue is caused by an O/S problem on Solaris.
Please reference Solaris Bug 6672470.
Please apply Sun Solaris patch 138888-01 to resolve the issue.
OR
If you are using 127111-01
modify /etc/system with

set maxfastscan=0x2000
set kpm_enable=0

References:
Aiowait Timed Out 1 Times Database Not Responding Cannot kill processes [ID 743425.1]

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