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[Linux-cluster] Re: Linux (qmail) clustering

If this is a high volume mail server, GFS and qmail are not going to work nicely together (at least they didn't in my experience). I had a qmail server running on a two node cluster with about 300 virtual domains. Load on each node would spiral out of control until I dropped one of the machines out of the cluster. I've had success with GFS and other services (i.e. ftp and web) but just not with qmail.

After googling around some, it appears to be the "NFS safeness" in how qmail delivers mail (see http://www.redhat.com/archives/linux-cluster/2005-September/msg00220.html) that ruins performance on GFS.

If this diagnosis is incorrect I'd love to be straightened out because my plan for a load balanced, fault tolerant qmail server had to be scrapped a couple of months back.


On 2006-04-23 10:55, Jan-Frode Myklebust wrote:
> On 2006-04-11, Haydar Akpinar wrote:
> >
> > I would like to know if it is possible to do and also if any one has done
> > qmail clustering on a Linux box.
> Since qmail is Maildir based (no locking problems to worry about), I think
> this should be fairly easy to do. You'll just need to decide which
> directories needs to be shared, and which needs to be private to each node. > It will probably be enough to have the home directories on a shared storage
> (GFS or simply just NFS), and just do load balancing by equal MX record
> priorities.
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