NFS

1. Network file system (NFS)
   1. NFSv2
   2. NFSv3
   3. NFSv4
      1. NFSv4.1
      2. NFSv4.2

Network file system (NFS)

• does not support SMB/CIFS
• server-side locking and sharing
• thin provisioning
• CPU overhead
• usual applications: AD, SQL, Sharepoint, Hyper-V, replication/backup

NFSv2

• UDP

NFSv3

• UDP/TCP
• 64-bit file size and offset
• async write on server
• authC using IP

NFSv4

• TCP 2049 only
• file caching
• authC using credentials, per user
• NTFS-like ACL instead of RWX
• stateful
• request/response batch ⇒ better WAN utilization

NFSv4.1

• pNFS: parallel access to clustered servers
• session trunking ≡ NFS multipath: parallel access to volume via several addresses

NFSv4.2

• server-side clone&copy
• application I/O advise: instructs server how to behave (e.g., sequential/random access)
• sparse files: does not transmit empty segments as zero, specifies such segments in metadata
• MACsec
• application data block (ADB)