[DRBD-user] DRBD Fencing with RHCS

Harald Rinker harald.rinker at unitedprint.com
Fri Jan 4 17:52:08 CET 2008

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Sean Brown schrieb:
> I'm new to setting up clustering and DRBD. We're setting up a HA NFS 
> cluster between 2 nodes, each node is running CentOS 5.1. I have DRBD 
> working between them and RHCS is working with exporting a NFS export 
> backed by GFS. The GFS volume is sitting on drbd0. When everything is 
> running everything is good.
> However, I simulated a failure by shutting down the node that held the 
> NFS service while a client was writing to it. Now here's what happened:
> Node 1 went down
> NFS Client paused during a write
> NFS Service came up on Node 2
> NFS Client finished write
> NFS Client issued an ls
> NFS Clients ls hung, other processes on the Client were fine
> ls issued on Node 2 against the GFS filesystem, this also hung. All 
> other processes on Node 2 were fine.
> So what happened is DRBD hung without effecting any other operation. 
> When Node 1 was brought back online communications with Node 2 did not 
> resume and a Split-Brain situation occurred.
> Now looking into this I believe that the problem is that the DRBD 
> process/service is not properly fenced, or possibly not fenced at all. 
> Now I see a lot of documentation fencing DRBD with Heartbeat but as I 
> am already using RHCS for other services which depend on DRBD working, 
> is it possible to use RHCS do handle the fencing and heartbeat 
> processes? How would I go about configuring it?
> -Thank you in advance.
> _______________________________________________
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> drbd-user at lists.linbit.com
> http://lists.linbit.com/mailman/listinfo/drbd-user
Hello Sean,
i think you must copy /var/lib/nfs to your drbd device and make 
/var/lib/nfs a link to this

Regards Harry

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