I think if you have Veritas Quick I/O it would have similar performance as RAW Device.
If you have OnlineJFS without the Quick I/O then your parameters is doing nothing as other suggested. However with Online JFS you can use direct I/O which has a decent performance, by default direct I/O is not enabled, you have to modify the mount options.
Both Online JFS and Veritas Quick I/O are very expensive though....
I remember reading Oracle Metalink Notes saying that Disk Async IO is not supported on HP-UX for Cooked Filesystems.
We have disk_async_io=true for our Database in HP-UX 11.11 , Oracle 184.108.40.206 and 10g Servers.
I would like to ensure that my understanding and setting is right.
Right now we are using 4 dbwr's. I appreciate your suggestions.
Our UNIX SA says " Cooked Filesystems have their own Asynchronous Mechanisim that equally replaces Oracle Async IO"
What Am I missing here
Appreciate your suggestions.
-- Regards & Thanks BN