(redirected) Dell Power Vault Md3600

Hi,

I have Dell Power Vault Md3600 Series SAN, Two Brocade Switch 300 Series and 6 Dell powerEdge R620 blade servers. Each server has two Fiber Ports,

Each server's Fiber port 1,  Connected with Switch 1.

And  Server's port 2,  Connected with switch 2.

from the last rest two port of the Switch is connected with SAN controller one and second is connected with controller two, the same did with second switch.

I done the zoning part into the Switch. 

Everything is working fine. i distributed the HDD to two host.

Problem is when i switch OFF the Switch one for checking the redundancy its works fine.

But when I Switch off the Second switch then redundancy not works......

I really not able to understand where problem is??? I did the zoning again check everything. but still the same problem..........