RE: Solaris Direct I/O
Date: Tue, 9 Feb 2010 09:30:38 -0800
I can answer 2 of these, at least this is understand:
- Check the mount options with your sysadmin, they should look like this ,mincache=direct,convosync=direct, this will set things up for direct i/o.
- Use truss, if you see kaio failure followed by several lwp processes spawning then you are using async i/o. solaris implements kernalized async i/o, so the kaio calls will fail and the OS will respond with several LWP serial process to simulate async i/o. with filesystem options to SETALL, it should be doing async i/o.
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Taral Desai
Sent: Monday, February 08, 2010 10:45 PM
Subject: Solaris Direct I/O
We are using sparc 64bit v 10 with oracle 10.2.0.3. Above that we use SAN storage.
- How to find if storage is mounted for direct or async io
- We had set filesystem option to setall. How to verify it's doing direct or async. As with truss i see many kaio failure and then it invokes lwp process which do i/o in chunks. So, is there a different call for SAN.
3 Is there any benefit using veritas ODM over oracle ODM ?Received on Tue Feb 09 2010 - 11:30:38 CST