on 5/5/2011 1:04 AM Becker, Ronny spake the following:
Hello, I am using Dovecot 1.2.9 on a 32bit on Ubuntu 10.04.2 LTS.
We got one user who uses folders in an "exessive" way. He has got 704 subscribed folders. That means about nearly 3000 folders on the filesystem. Since ~ a week the user couldn't work because of timeouts when connecting to Dovecot (IMAP). Thunderbird doesn't show any folders - timeout - the webmail System (Groupoffice) only presents the INBOX.
I did some debugging and found that a lsub "" "*" that is used by Thunderbird takes > 5 minutes. Thunderbird disconnects after ~1 Minute showing the timeout. I entered the command directly via port communication. So this is no clientside problem. But there is no error message or something else in any logs.
I did some debugging with strace, too. It's about 22MB only for running the lsub command !? The Mailbox size is about ~2.2GB, so this should be no problem. The maximum subfolder level is about 13 - could this be a problem? You can find the structure (simply shown) attached.
Thanks for any help!!
Best regards Ronny Becker
What is the underlying filesystem, and if its ext3, is dir_index set on?