ISCSI and multipath

[Gary Palmer]

On Fri, Jan 09, 2009 at 12:03:26PM +1100, Andrew Snow wrote:
> Sossi Andrej wrote:
> >Another question about MD3000i.
> >My MD3000i have 2 controller and every controller have 2 net interface.
> >My FreeBSD server is connect on NAS server with 2 network cards throw 
> >out 2 switch on th 2 networks. (192.168.253.X and 192.168.252.X).
> >In the official manual is written if the primary controller (or net) 
> >have a problem the NAS automatically switch disks drive on second 
> >controller. For this is required MPIO on Windows or MPP on Linux. It is 
> >supported also on FreeBSD?
> 
> If you only wanted to do failover at the network level with shared IP 
> address, you could use lagg.
> 
> However, since you have different IP subnets for each network, you 
> probably want to look at using geom_fox.  You set up two iSCSI 
> connections, one to each controller, and geom_fox on top to make it 
> appear as a single disk device.

FreeBSD 7.0 and later also has geom_multipath, which I've been
told (no experience) is a better approach.  I suggest you 
review documentation for both and make your own decision

Regards,

Gary