[DRBD-user] NFS writes and DRBD

Dave Dykstra dwdha at drdykstra.us
Fri Jun 12 23:42:24 CEST 2009

Yes, don't attempt to use the same servers to both serve NFS with DRBD
and mount the NFS volume.  It is nothing but headaches.  See
especially the Hints section.

- Dave

On Fri, Jun 12, 2009 at 09:26:15AM -0700, Stuart Sheldon wrote:
> Hi Keith,
> We actually did a similar setup using NFS. The only difference was we
> dedicated both DRBD servers to do nothing else but DRBD and NFS. We then
> use many (currently 8) front end servers that attach to the NFS share.
> This HOWTO was extremely helpful to me:
> http://www.howtoforge.com/high_availability_nfs_drbd_heartbeat
> Hope this helps.
> Stu
> Keith Edmunds wrote:
> > I'm new to the list. This has possibly been discussed before, in which
> > case a pointer would be welcome.
> > 
> > We're planning a two-node heartbeat-controlled web server cluster possibly
> > using DRBD to share the web sites' data between the two nodes. Some of the
> > sites on this server are dynamically updated by users (eg, uploading
> > photos or whatever), so it's important that both web servers can write to
> > the shared data directories.
> > 
> > Under consideration is using DRBD and making the primary accessible to the
> > other web server by mounting it r/w via NFS. I realise that the NFS
> > metadata will need to be on the DRBD volume, and that we need to get the
> > appropriate services stopped/started if there is a failover, but in
> > principle are there any problems with this? Is there any advice regarding
> > NFS parameters for such a configuration?
> > 
> > We'd rather use ext3 + NFS than one of the cluster filesystems and a
> > master-master configuration, but if there are better ways of running a two
> > node webserver cluster where either node can update the data then we'd
> > like to consider them.
> > 
> > Thanks for any help -
> > K.

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