Am 05.05.2011 22:24, schrieb Scott Silva:
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?
The underlying Filesystem is ext3 with dir_index enabled. As Timo
Sirainen explained the problem seems to be the ACL plugin. With ACL
enabled every folder is scanned for a dovecot-acl file and that needs a
lot of time. In this case there are >700 subscribed folders using >3600
folders on the filesystem.
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