Linux Hangs Copying Large Files to a WD My Book Live Duo over NFS? Mount with UDP

We ran into trouble copying large amounts of data to a Western Digital My Book Live Duo NAS. The share was NFS-mounted on an Oracle/CentOS 6.5 VM, and as soon as a file over 1 GB was copied, the machine would hang.

The Fix: Use UDP for the NFS Mount

NFS mounts use TCP by default, but for Linux to work reliably with this drive, the mount needs to use UDP:

mount 192.168.1.45:/nfs /transport -o soft,timeo=60,intr,proto=udp

After remounting with proto=udp, large file copies completed without the system halting.