[Ocfs2-users] question about _datavolume

[srinivas eeda]

On 12/8/2011 7:52 AM, Shashank wrote:
> I want to know whether _datavolume can be used for non-database
> filesystems. Oracle support is recommending the use of _datavolume
> along with _netdev
datavolume option was a way to tell older oracle database versions that 
the filesystem does support direct io. When mounted it with this option 
it returns oracle v1 magic number which older database code was aware 
off. It is not required for newer versions and certainly not required 
for non-database fs.
> In reading the documentation, I have found the following which
> suggests _datavolume should never be used for anything other than the
> CRS/OCR/DATA/REDO/ARCHIVElogs/control files.
>
> The files we are storing are conucrrent log and output files as well
> as some temporary files. These are shared between 2 concurrent nodes
> and 2 database nodes. Can you advise is my assumption of not using
> _datavolume is correct?
>
> http://oss.oracle.com/projects/ocfs2-tools/dist/documentation/v1.2/ocfs2_users_guide.pdf
>
> It's printed in bold :
>
> Oracle database users must mount the volumes containing the Voting
> Disk file (CRS), Cluster
> Registry (OCR), Data files, Redo logs, Archive logs and Control files with the
> datavolume,nointr mount options. The datavolume mount option ensures
> that the Oracle
> processes open the files with the o_direct flag. The nointr mount
> option ensures that the reads
> and writes on that device are not interrupted by signals. All other
> volumes, including Oracle
> home, should be mounted without these mount options.
>
>
>
> The _netdev mount option is a must for OCFS2 volumes. This mount
> option indicates that the
> volume is to be mounted after the network is started and dismounted
> before the network is
> shutdown. (The datavolume and nointr mount options are only required
> for Oracle data files, etc.)
>
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