Multiple clients creating/deleting files in the same directory

Hi all,

We are testing a small cluster with 1 MDS, 2 OSS, and 5 clients. When  
all clients are writing to independent directories as is well. When  
one client tries to list the contents of a directory that another  
client is creating/deleting files in, Lustre will hang and /var/log/ 
messages shows a lot of "printk suppressed" messages.

Is this normal behavior or can we do something to minimize it  
(besides not having two clients work in the same directory)?

Scott