We have Two Exchange 2016 Servers running in DAG mode and have one mailbox database on both servers (40 Mailboxes). The Database are created on Drive ( NTFS). Now we are planing to add two more physical servers and stretching the environment to DR and also want to use ReFS file system. We have following scenarios in our mind so please let us know which one is best suitable and if you guys have any other idea then please share with us.
1. Create another DAG with servers which have REFS formatted Drives, set ReFS on DAG (Set-DatabaseAvailabilityGroup NameOfYourDAG -FileSystem ReFS ). After Move mailboxes from First DAG to this DAG.
2. Add the other two members in same DAG, create new Database on new server ( ReFS formatted Drives). Move the existing DataBase to the new server drive and then set the command (Set-DatabaseAvailabilityGroup NameOfYourDAG -FileSystem ReFS )
Please suggest how should we need to move ahead regarding to move database or DAG from NTFS to ReFS.