Re: How to confirm 'direct io' on linux?

From: <yong321_at_yahoo.com>
Date: 25 Aug 2005 20:05:51 -0700
Message-ID: <1125025551.818663.89810@z14g2000cwz.googlegroups.com>

NetComrade wrote:
> What should I _not_ be seeing?
> I assume I should be seeing some 'open' command on datafiles.. but I
> am not.. this is all i see on mount:

NetComrade,

As Mladen showed, you need to strace a background process when you *open* your database, not when you mount it. Make sure you did set filesystemio_options to directio (or setall). You can get a cleaner strace output by

strace -e trace=open -p <pid>

You can also offline and online a tablespace to watch open() calls if the database is already open.

Yong Huang Received on Thu Aug 25 2005 - 22:05:51 CDT