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Date: Thu, 02 Nov 2006 15:59:48 +0000
From: Tom Judge <tom@tomjudge.com>
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To: aymeric.muntz@free.fr
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Cc: freebsd-questions@freebsd.org
Subject: Re: Raid over NFS
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aymeric.muntz@free.fr wrote:
> hi list!
>
> I am actually seachring a solution for doing raid over NFS.
> My need is to have 2 mail servers sharing the same storage.
> For redundancy reason, I would like to have a duplicate partition (one on each
> server accessible by NFS) and do a software RAID (mirroring) on the other.
>
> Is there a well known and stable solution?
> It looks like vinum is not able to do that.
>
> I appreciate any return.
>
> Thanks
>
> Aymeric
>   

We have just set up something very similar, using ggate and gmirror.  
one box mounts the mirrored volume directly while the other mounts it 
via nfs.  If the master box fails then the secondry box can mount the 
file system directly.

I used the following as a basis for the configuration and am adding in a 
heartbeat system so that the backup server can automatically take over 
from the master.

http://www.phunsites.net/wp/2006/08/11/realtime-file-system-replication-on-freebsd/

Tom