topic Re: how do i disable async io in 11iv3 in Operating System - HP-UX

how do i disable async io in 11iv3

wvsa — Fri, 10 Oct 2008 19:39:48 GMT

Greetings all;

Installing 10gr2 on a 11iv3 rx6600 box. Oracle does not like async io enabled. How can I disable async io on the server. Did change /dev/async perms to 660. Is there something else I should do?

Thank you in advance for your responses.

Re: how do i disable async io in 11iv3

sen_ux — Sat, 11 Oct 2008 03:26:14 GMT

Hi,
You may need to set "fs_async" to 0.

sen

Re: how do i disable async io in 11iv3

Frank de Vries — Mon, 13 Oct 2008 04:47:08 GMT

Hi

This is a bug in Oracle bug ref 5359528

I don't know is you had to change the perms though.

I had this prob also but on an Itanium box of HPux and I found a note on metalink Oracle bug ref 5359528:

sql> alter system set disk_asynch_io=false scope=spfile;

Re: how do i disable async io in 11iv3

CurtisPatterson — Fri, 01 Mar 2013 23:24:37 GMT

The bug does not appear to have been fixed on Oracle 11.2.0.1.0. I've been diagnosing random application disconnects to the DB and found an Oracle alert log refering to trace files that had thousands of entries stating "Ioctl ASYNC_CONFIG error, errno = 1".

Below is the SQL I used to see that the Oracle setting was wrong, and also the SQL I used to change it to FALSE (as stated in the original post). Note that you must bounce the database after making the change.

Connected to:
Oracle Database 11g Release 11.2.0.1.0 - 64bit Production

SQL> show parameter disk_asynch_io;

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
disk_asynch_io boolean TRUE

SQL> alter system set disk_asynch_io = false scope=spfile;

system altered

SQL> shutdown immediate;

...

SQL> startup;

...