multipath iscsi on debian linux with an md3000i

[Shyam_Iyer at Dell.com]

>Is this expected? If I set up multipath correctly and pull the
preferred controller should the other two block devices magically start
working? That is, is having two controllers an active/passive
configuration? 

Yes. This is the correct approach.

>Can you balance the load across two controllers, or four nodes in total
or is the multipath only for redundancy?

Round robin load balancing algorithm is available with DM-Multipath.

-Shyam Iyer