You mount an NFS share with -o vers=4.2 . The server runs NFSv4.0. You try to run cp --reflink – boom. Error 45. Part 3: How to Make "NFS VLTED 45" Work – Step-by-Step Troubleshooting Now for the practical guide. Follow these steps in order to diagnose and resolve the issue. Step 1: Identify the Exact Error Context Don't rely on vague logs. Run the following on the client :
tcpdump -i eth0 -s 0 -w nfs-debug.pcap port 2049 # Reproduce the error, then Ctrl+C Analyze with Wireshark or tshark : nfs vlted 45 work
# Before (too restrictive) /export *(rw,sync,no_subtree_check) /export *(rw,sync,fsid=0,crossmnt,no_subtree_check,sec=sys) You mount an NFS share with -o vers=4
server:/export /mnt/nfs nfs defaults,vers=4.0 0 0 You can instruct the NFS client to ignore unsupported attributes by adjusting mount options: Error 45
The fix? VMware ESXi’s NFS client defaults to NFSv4.1. The NetApp filer was still on NFSv4.0. Error 45 appeared due to unsupported RECLAIM_COMPLETE operation.