NFS seems to be preventing the scm load command from completing on a linux system.

NFS seems to be preventing the scm load command from completing on a linux system.
This behavior occurs whether I use either rtc 4.0.2 or rtc 5.0.1 scmtools.
Prior to running the load, I login to the RTC repo, I create the new directory in the NFS directory, cd to that directory,
and issue:
scm load wkspace_name dir1/dir2/dir3/filename -r repo_name --force --dir /mnt/RTC_dir/test

The command never completes, only resulting in the creation of a .metadata directory that contains a .lock file.

The exports file on the NFS server uses these options:
/data/RTC_dir hostname(rw,secure,root_squash,no_subtree_check)

The fstab file on the NFS client
NFS-server:/data/RTC_dir /mnt/RTC_dir nfs rw,vers=3,tcp,suid,hard,intr,timeo=600,bg 0 0

if I run the same command from the /tmp local file system, it works:

user@hostname /tmp$scm load wkspace_name dir1/dir2/dir3/filename -r repo_name --force --dir /tmp
Successfully loaded items into the sandbox.

Is there some additional configuration needed somewhere that I am missing?