[Ocfs2-users] 2 node cluster, Heartbeat2, self-fencing

[Sunil Mushran]

Both should not fence. In a 2 node setup, the lower node number
should not fence. That is, I am assuming that the iscsi is up and that
the lower node (or both) can rw to the iscsi device at all times.

Matthias Dahl wrote:
> Hello everyone.
>
> I am currently working on setting up new servers for my employer. Basically we 
> want two servers, all of them running several VEs (virtual environments, 
> OpenVZ) which can dynamically take over each others job if necessary. Some 
> services will run concurrently on both servers like apache2 (load balancing), 
> so those need concurrent access to specific data.
>
> We had a close look at OCFS2 to be able to have our web data available on both 
> machines (for example). (RAID1 on both servers, exported via iSCSI and OCFS2 
> running on top of that) The problem we ran into was that if the connection 
> between the two servers was lost, both would self fence which is not the way 
> we want things to be. (high availability)
>
> So after a lot of research, I discovered that Heartbeat2 now supports OCFS2 
> and can take over the disk heartbeat job that OCFS2 requires. Unfortunately 
> it seems like one needs patched OCFS2 kernel modules as well as patched 
> userspace tools. I found the kernel part but I couldn't find any patches for 
> userspace support.
>
> Is there any time frame when those get merged into OCFS2 officially? And are 
> those patches available somewhere on the net for download? If not, is there 
> any other way we could setup our systems and don't have both machines self 
> fence when the network connection goes down? It'd be nice if one could 
> specify more tests to determine what server should self fence and what server 
> should stay online.
>
> Thanks for any help and any hints in advance.
>
> Best regards,
> Matthias Dahl
>
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