Showing results for 
Search instead for 
Did you mean: 

Async I/O

Archana Prasad
Occasional Advisor

Async I/O


Does Hp-UX 11.0 support async I/O on hfs filesystems?

If so, is it more performance efficient to use async I/O while running an Oracle database.

Thank You very much.
James R. Ferguson
Acclaimed Contributor

Re: Async I/O


Yes, but... Take a look at the caveats here:

If you have vxfs (JFS) filesystems (you should, in my opinion), then look too at the documents "Mount options explained" (ID #KBAN00000258) and "VXFS intent log explained"
(ID #KBAN00000151). These offfer good explanations of various JFS mount options, along with some suggestions for trading performance and integrity.

Together, these documents should help you make an informed choice.

Stefan Farrelly
Honored Contributor

Re: Async I/O

Yes, async I/O is supported on HP-UX. It is apparantly faster to use, including for databases, but at a much greater risk of losing data if you have a crash.
Im from Palmerston North, New Zealand, but somehow ended up in London...
Honored Contributor

Re: Async I/O

I don't think a lot of those data sync mount options are available unless you have online JFS .. can anyone verify?

It works for me (tm)