Hi there -
When you say two ZFS 7320 servers in Exalogic I assume that you are referring to Active and Passive Storage Heads as part of Exalogic rack for e.g. SN01 and SN02. If you are referring to using 7320 ZFS Appliance part of Exalogic Rack for external non Exalogic Linux systems outside of Exalogic Rack, this is usually not a best practice. Because 7320 ZFS Appliance part of Exalogic is designed and tested for efficiency basically for Linux/(or) Solaris compute nodes part of Exalogic rack.