[Gluster-users] new to gluster, is this possible?

[John Mark Walker]

One thing to be aware of - which kernel version you're using and the fuse module included in it. If it supports readdirplus on Fuse, the performance increases quite a bit on read-heavy workloads:

http://lwn.net/Articles/532705/

I don't know if CentOS 6.4 has it backported or not, but 6.5 will. Likewise, recent versions of Ubuntu and Fedora with kernel version 3.8+ will have it. 

-JM


----- Original Message -----
> -----Original Mail-----
> From: Jeff McKeon [jeff.mckeon at ashcortechnologies.com]
> Sent: 07.10.13 - 16:20:06
> To: gluster-users at gluster.org
> 
> Subject: [Gluster-users] new to gluster, is this possible?
> 
> > Hello all,
> >
> > I'm completely new to gluster and want to know if what I'm thinking of
> > using it for is possible.
> >
> > I've got a mail server (iRedMail to be exact) on a OpenSUSE 12.3 that
> > stores all mail data in /data.
> >
> > I would like to put up a clone of this server and, using gluster, create
> >
> > a master-master replication scheme of the /data directory on both so
> > that I have a hot standby should server A go down.
> >
> > A) is this a legitimate use of Gluster
> 
> Yes. You could also just use a real master-master replication(you describe a
> master-slave with hot-standby) where both mailservers are used
> simultaneously.
> 
> But you should be aware that performance with small files and GlusterFS is
> *really* bad and listing many entries in one folder is really slow. So
> Gluster isn't really good for your workload and could be a showstopper,
> depending on your needs.
> 
> > B) If A, is there some documentation I can be pointed to to sort it
> > out?
> 
> If I remember correctly, there's an article on the setup with GlusterFS in
> the iRedMail wiki. You should start looking at that. It should tell you how
> you correctly set up the GlusterFS server and clients, configure your server
> and iRedMail and a multi-master MX entry in your DNS. I've tested this in a
> small setup a while ago but I didn't have the time for a large scale test -
> so if you go for it I would really like to hear what performance and
> responsiveness of a real-world installation are like. :)
> 
> >
> > --
> > Best Regards,
> >
> > Jeff
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