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FAS3220 Dual Chassis HA interconnect error

Hi everybody

I start to create a FAS3220 Dual Chassis HA enviroment,

but we don't have optional addition sas adapter,

so I decide to connect the controller to disk shelves by single path,

the topology just like that

but the cluster failover is not working,

when I use the cf status on each node,

the system show:

partner may be down, takeover disabled because of reason (partner mailbox disks not accessible or invalid)

FAS3220 has disabled takeover by partner (interconnect error)

RDMA Interconnect is down (Link 0 down).

When I use the cf monitor on each node,

the system show:

current time: 15Aug2014 04:19:51

UP 02:00:49, partner 'unknown', cluster monitor enabled

RDMA Interconnect is down (Link 0 down), takeover capability off-line (partner mailbox disks not accessible or invalid)

takeover by partner off-line (interconnect error)

partner may be down, last partner update UNKNOWN (15Aug2014 04:18:37)

When I use the cf hw_assist status

the system show

Local Node(FAS3220) Status:

        Inactive: FAS3220not monitoring alerts from partner(partner)

                Interconnect is down between nodes.

Partner Node(partner) Status:

        Can not read partner state

        Interconnect is down between nodes

so I open the Oncommand System Manager to see the network interface

I see the the c0a and c0b is show the status like this

but I don't know where is my mistake?

what will make the interconnect port(c0a and c0b) be down?

Please help me!

Thanks very much

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