I'm trying to share maildir directories with NFS from a backend file
server to distribute load on a couple frontend pop/smtp boxes. In my
first tests, everything works ok at the moment with vpopmail,
qmail-pop3d and courier-imapd managing remotely exported mailboxes, but
I get a nfs-related locking error when trying to add/edit user accounts,
changinng passwords, quotas, etc.
vpopmail tools complaint with non-NFS related error messages, but when
running them thru strace, I find a timeout while trying to lock vusers
cdb files. NFS client boxes are linux, server is a netapp.com filer, nfs
mount options are the defaults (got error when trying to switch to
tcp-based nfs), and lockd service is enabled.
I know this is not directly related to vpopmail, but what nfs settings
are appropiate for this purpose?