[Dovecot] Linux, Maildir over NFS, Locking problems

[Terrence Martin]

Hi,

I am having problems with file locks with my NFS mounted Maildir setup.

NFS Client/IMAP Server is RHEL3 clone whitebox and NFS server is a 
Fedora Core 2 system.  Both are running lockd as far as I can tell.  
dovecot is installed with Dag's latest dovecot RPMs for RHEL3. Time is 
synced between the two systems.

Here is the pertinent log file entry

dovecot: Dovecot starting up
Apr  7 11:17:42 sentry imap(tmartin): 
/home/tmartin/Maildir/.subscriptions failed with subscription file 
file_wait_lock(): No locks available

Now what I can find in nfs.txt is that I need to use fnctl is this

".customflags and .subscriptions files require fcntl() locking currently.
   Many NFS servers don't support it, at least without a separate lockd
   daemon. These will be fixed later to be NFS-safe by default."

My question is am I using fcntl? The only reference I can find in the 
config refers to mbox formats, but I am using maildir. Setting the one 
reference to fcntl does not seem to have any effect. Is there a 
configuration setting to tell the server to use fcntl locks or a way to 
tell if it is trying to use fcntl locks? 

Thanks for any tips,

Terrence