Another option possibly is DRBD (http://www.drbd.org).  Version 8 is
nearing gold which will allow concurrent access to 2 block devices.

Of course, I'm not entirely sure if this is a linux only solution and am
only tossing it out as an option for those looking for a cheaper/free
solution ;) 

t.

> -----Original Message-----
> From: DAve [mailto:[EMAIL PROTECTED] 
> Sent: Tuesday, January 30, 2007 5:49 AM
> To: vchkpw@inter7.com
> Subject: Re: [vchkpw] NFS Clustering
> 
> Nicholas Harring wrote:
> > If you haven't yet bought hardware for the NFS, NetApp makes this a 
> > snap with SnapMirror. I don't remember all of the ins and outs, but 
> > its perfect for situations like this, its very bandwidth efficient, 
> > and its got the same bullet-proof reliability their 
> products are known for.
> 
> We currently use a Solaris Enterprise 250, old, but stone 
> cold reliable. 
> I'll need something in the other NOC. I've not looked at NetAPP.
> 
> > 
> > Otherwise I'd think your SAN vendor should have some form of block 
> > level replication available.
> 
> This is where I am headed. We are looking at SANiq (Lefthand 
> Networks) which can do volume replication in realtime. I am 
> thinking that a NFS server in each location, sharing a iSCSI 
> volume, would be worth looking into. Let the SAN keep the two 
> volumes in sync and let NFS handle the multiple access to the volume.
> 
> > Hope that helps,
> 
> Absolutely, thanks.
> 
> DAve
> 
> > Nick
> > 
> > -----Original Message-----
> > From: DAve [mailto:[EMAIL PROTECTED]
> > Sent: Monday, January 29, 2007 3:59 PM
> > To: vpopmail
> > Subject: [vchkpw] NFS Clustering
> > 
> > Good afternoon/evening/morning,
> > 
> > We have been tasked with splitting our mail services 
> between our two 
> > NOCs. We have ordered a 1GB fiber connection between both locations.
> > 
> > We will be moving one of two mailgateways, two of four pop 
> toasters, 
> > and
> > 
> > one of two smtp servers to the second NOC. Both border 
> routers will be 
> > BGP advertising the same IP range and each location will 
> have hardware 
> > load balancing. I can easily setup replication for my MySQL 
> backend, 
> > but
> > 
> > my NFS mail store is another concern.
> > 
> > Is anyone else working with this type of configuration? 
> I've not yet 
> > looked into NFS clustering or what may be involved. (I will have a 
> > iSCSI
> > 
> > based SAN available which will have nodes/modules in both 
> geographical 
> > locations, which may help).
> > 
> > Any advice on what methods/tools work well is appreciated.
> > 
> > Thanks,
> > 
> > DAve
> 
> 
> --
> Three years now I've asked Google why they don't have a logo 
> change for Memorial Day. Why do they choose to do logos for 
> other non-international holidays, but nothing for Veterans?
> 
> Maybe they forgot who made that choice possible.
> 

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