Several computers quickly sending files to a single computer via
NFS. All computers hang. This is unexpected (and incorrect) behavior.

The computers should say they are overwhelmed and abandon
the file transfer with an informative message including the name
of the file not transferred.

Files are 8 MB in size. Two computers are sending to a third. Each
sending computer sends at a rate of one file every five seconds
(on average) for a total rate of 24 files per minute. 100 MB/s ethernet.
The file-send program is a background process. If the send fails, it is 
attempted again in 10 seconds.  10 attempts are made and then the 
send is abandoned. Failure usually occurs between 10 and 200 files.

Work-around is simple,i .e. slow the rate and wait for completion of each
transfer. However, this does not fix the problem. Overwhelmed
file systems or NFS servers should never hang the system. They 
should abandon the problem with a clear message.