[Ocfs-users] Observations

[Sunil Mushran]

Yes. The buffer cache in kernel does not keep track of
changes across the cluster. So, if node 1 has an image
of the block on disk and node 2 changes that, the
buffer cache in node 1 still reflects the old image.
o_direct solves that as the disk always contains the
current image.

On Mon, 2004-08-30 at 13:31, Varghese Abraham wrote:
> Hi Sunil , Wim
>  Thanks for your inputs.
> 
> We are on Linux AS 2.1 kernel e38
> OCFS version 
> ----------------------------------
> [root at usingorcdb03 root]# rpm -qa | grep ocfs
> ocfs-tools-1.0.10-1
> ocfs-2.4.9-e-enterprise-1.0.12-1
> ocfs-support-1.0.10-1
> [root at usingorcdb03 root]#
> --------------------
> 
> 
> Regarding point 2, can you clarify a bit further.
> 
> What I understand from your / wim's mail is that data blocks would be present somewhere in memory buffer
> and when we copy / ftp , those Memory blocks are getting used.
> Is my understanding right.  ?  
> ( Should this be the case even when the database is shutdown , that Linux would use memory buffers to do a copy /ftp. )
> 
> R'gds
> Varghese Abraham.