[Dovecot] Error: IMAP(user): nfs_flush_file_handle_cache_dir: rmdir(/var/mail) failed: Device busy

[Grandy Fu]

Hi,

I am running dovecot 1.1.10 and 1.1.11 on Solaris 10, mailboxes are in 
mbox format and served by Solaris 10 NFSv3, the dovecot cache is on 
local disk.

Some of my users always had above nfs error and their mailbox usually 
very big, over 100M, 400M, or even 800M.

Grandy