FW: [Ocfs-users] Observations

Shivaprasad Kambalimath
Mon, 30 Aug 2004 16:13:09 -0000

Hi Sunil,

I'm looking into this thread now.

Does this mean we cannot use FTP option to copy OCFS files to ext3? If
so, is there any ftp version available for OCFS, similar to cp
--o_direct?

Also, is there any version of sync available for OCFS (in normal FS,
sync does a refresh of FS from kernel cache so that the FS is
consistent). By this can we say that the FS shard by both nodes is
consistent?

Regards,
Shiva

-----Original Message-----
From: Shivaprasad Kambalimath
Sent: Monday, August 30, 2004 1:55 PM
To: Varghese Abraham
Subject: RE: [Ocfs-users] Observations

Varghese,

This means we cannot use FTP at all. Pls ask them if there are any
tools/commands to do ftp.

Also ask abt options of sync (in normal FS, this does a refresh of FS
from cache) if anything of that sort available for OCFS.

-shiva

-----Original Message-----
From: Varghese Abraham
Sent: Monday, August 30, 2004 1:46 PM
To: Shivaprasad Kambalimath
Subject: FW: [Ocfs-users] Observations



-----Original Message-----
From: Sunil Mushran [mailto:Sunil.Mushran@oracle.com]
Sent: Monday, August 30, 2004 1:45 PM
To: Varghese Abraham
Cc: ocfs-users@oss.oracle.com
Subject: RE: [Ocfs-users] Observations


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@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@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.