Check if async_io is enabled at disk-level
- From: Deepak Sharma <sharmakdeep_oracle@xxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Mon, 15 Sep 2008 21:39:09 -0700 (PDT)
Hi,
We are using ODM (Oracle Disk Manager) on one of our 10.2.0.3 DBs, and the
disk_asynch_io is TRUE in the database. I have also read that ODM supports
kernel asynchronous I/O. The platform is AIX 5.3
Using 'nmon' and choosing "A = Async I/O Servers", this is what we see :
Asynchronous-I/O-Processes
Total AIO processes= 100 Actually in use= 0
This might indicate that AIO is not happening at kernel-level.
How else can we verify if async I/O is actually happening at Kernel-level? We
could possibly truss the DB Writer process(es) and check for the kernel-level
calls for writes - what should we look for? Is it kiowrite() instead of plain,
write() ?
Thanks,
Deepak
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