Re: [Xen-users] high availability iscsi and xen setup

[Mark Adams <mark@xxxxxxxxxxxxxxxxxx>]

On Fri, Nov 05, 2010 at 10:54:20AM +1100, James Harper wrote:
> > 
> > I was originally planning on having 8 gigabit ports on each DRBD
> > (storage) server, going in to 2 seperate switches using multipathing.
> > each xen host would also have 2 gigabit links in to each switch also
> > using multipathing.
> 
> I guess it depends on your disk bandwidth. If you have >200Mbytes/second
> disk throughput then you'll need to add more network ports to prevent it
> becoming a bottleneck. I'd definitely be plumbing the DRBD network
> connections through directly though. At least if you have a switch
> failure you won't get split brain.
> 
> > This way I would be covered for switch failure also, any thoughts on
> > that? This would mean running DRBD and "SAN" traffic on the same
> > network, is this not advisable?
> > 
> > alternatively direct connected 10G CX4 port for DRBD traffic and 4
> ports
> > (2 in to each switch with multipathing) would also be good I guess?
> 
> Every write goes to the primary DRBD server which then sends it to the
> secondary DRBD server. I figure that keeping them on separate networks
> is a good idea.

Thanks for your replies James. With regards to network redundancy, what
do to ensure a switch failure doesn't affect your uptime? Do you have
any opinion on including multipathing in the setup?

Cheers,
Mark

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