On Mon, 2009-12-07 at 11:24 -0800, Jeffrey Nikoletich wrote: > Also is there is hard limit on the amount of folders dovecot can handle? I > have a user who has over 3000 folder (including subfolders) that is having > issues with delays in loading, moving, and deleting messages.
Are you sure those problems are even caused by the number of folders? There are only two issues I can think of: 1) Client LISTs all folders, which can take a while to download. Clients don't usually do this very often. 2) Filesystem is being slow. If you're using filesystem with directory indexes (and most are nowadays indexed) I don't think 2) should be much of a problem. And I think even without indexes OS would have cached the directory entries in a way that accessing the same directory would always be fast. So have you looked at other potential problems, like if deleting messages is slow and deletion is done by move-to-Trash, does the Trash have tens of thousands of messages? And at least ext3 already limits the number of folders that can be created with Maildir++ to 31998. That's probably good enough as a folder quota. :)
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