Dell Networking N4000 Series Configuration Manual page 203

Figure 9-15. NSF and a Storage Area Network
When the stack master fails, session A drops. The initiator at 10.1.1.10
detects a link down on its primary NIC and attempts to reestablish the
session on its backup NIC to a different IP address on the disk array. The
hardware forwards the packets to establish this new session, but assuming the
session is established before the control plane is restarted on the backup unit,
the new session receives no priority treatment in the hardware.
Session B remains established and fully functional throughout the restart and
continues to receive priority treatment in the hardware.
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Managing a Switch Stack