RE: UNIX file system read/write locks

  • From: Tanel Poder <tanel.poder.003@xxxxxxx>
  • To: exriscer@xxxxxxxxx, '_oracle_L_list' <oracle-l@xxxxxxxxxxxxx>
  • Date: Mon, 11 Sep 2006 20:29:06 +0800

The file level write locks still apply to many filesystems, even the ones
which support direct IO.
However, some vendors have introducted concurrent direct IO option into
their filesystems. 
Solaris has CIO since some update of Solaris 8. 
I've used CIO option on AIX 5.2 as well.
I haven't heard about CIO for Linux so I guess they don't have it.
Also, you have to manually enable concurrent IO in filesystem mount options
in order to use it.
For Oracle 9.2 on AIX CIO stuff, read this article:


From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of LS Cheng
Sent: Monday, September 11, 2006 16:38
To: _oracle_L_list
Subject: UNIX file system read/write locks


I was wondering if UNIX/Linux filesystem read/write locks still applies in
modern filesystems such as qfs/vxfs/OnlineJFS/ext2/ext3?


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