[SOLVED] sharing single LUN from a SAN for samba running on 2 or more machines

procfs · 09-26-2011, 02:48 PM

Hi this sounds like a stupid question

I have a SAN and I need to present the same LUN to two machines running on sumba, which will in turn share the same LUN out to clients.

My question is with out cluster software how can I use the Same LUN (chunk of disk space from the SAN) on tow or nor machines with out corrupting data on share or can this be achieved.

My OS is Oracle linux 5.6 (64)

currently I am using an NFS mount on this two samba machines, to share.

Thanks and Regards

anomie · 09-26-2011, 03:05 PM

NFS is for NAS. For a SAN (i.e. block-level access to the LUNs), you need a cluster-aware filesystem, or you will corrupt data.

procfs · 09-26-2011, 03:16 PM

Hi Anome, the problem is that I am running Oracle RAC and my application requires Samba share on both nodes by sharing the same LUN from the SAN, the only way out was to use an NFS mount on the two nodes and share it out using Samba.

I am quire sure that this is not the right way to do thing

I am not sure this is the right question but is there a way to use cluster filesystem with our configuring all this cluster environment (quorum disks, fencing etc)

Thanks and Regards

anomie · 09-26-2011, 03:31 PM

If you're already using Oracle RAC, the logical choice (IMO) would be OCFS2.

http://oss.oracle.com/projects/ocfs2/

procfs · 09-27-2011, 04:15 AM

great and thank you

procfs · 09-29-2011, 03:52 AM

Hi Anomie, ran in to an some problems

1, ocfs2console dose not recognize /dev/mapper device
2, even though I add the entries in the fstab ocfs2 volume this is not getting mounted, but if I mount it sing ocfs2console this is ok
3, I have created the OCFS2 volumes and mounts on both nodes. But if I create a file on one node I have to unmount and mount to see the difference on the other node. Is this the way this should work (I doubt it).

Thanks and Regards

procfs · 09-29-2011, 07:22 AM

Hi Anomie, it was my mistake since cluster.conf must be identical across the cluster nodes. Once I got this right things worked as per the document, and few of reference that I found by googleing

http://www.oracle-base.com/articles/...FS2OnLinux.php
http://linux.dell.com/wiki/index.php..._creating_node
http://www.drbd.org/users-guide/s-ocfs2-create.html

Thanks and Best Regards

anomie · 09-29-2011, 10:22 AM

Yep. OCFS2 is a good (but picky, and sometimes finicky) filesystem. Get your configuration in place and heavily tested before you try deploying this in production.