A customer performs a takeover and giveback of their controllers and notices that several of their NFS clients lose access to their volumes for a short period of time during the SFO process. The customer reviewed the LIF failover policies, and the polices are correct.

The clients are using NFSv4 to access the volumes. 

The export policies are incorrect and must be updated with node’s HA partner LIF information. 

A firewall is blocking the necessary network ports and needs to be updated to allow NFS communication. 

NFSv4 file locks need to be broken manually before initiating an SFO operation.