Hi, I am running a fair amount of stored e-mails on maildirs(10 GB+) in 846 folders that gets a fair amount of searching, and 20+ users accessing them, mostly via IMAP and a few POP3 accounts. I am running these on a Linode XEN server and have yet to hit any hard limits of "bare metal". User and Virual databases are plain text files.
# 1.2.9: /etc/dovecot/dovecot.conf # OS: Linux 2.6.32.16-linode28 i686 Ubuntu 10.04.1 LTS ext3 Postfix + Dovecot + SSL for Both with Amavisd seems a breeze. No problems related to infrastructure yet. Yet I will wait to see how this system will grow, as we are planning to include more users and doamins in our system in 2011. So: 1. I am very interested in these questions about performance 2. My setup should provide some people another way to do things, since I am not using mysql, ldap etc., kust plain old text files update via scripts 3. I am goind to test this system as we scale out, yet we are bound to add LDAP for authentication for single sign on at some point, and I will try to publish my benchmarks public, even if it is just for publicity's sake. Regards, Kerem On Sat, Dec 11, 2010 at 6:47 PM, Eric Rostetter <rostet...@mail.utexas.edu>wrote: > Quoting a...@test123.ru: > > Guys. Who is interested in obvious reasoning? >> > > The same people who are interested in vague questions? > > > Let me remind original concrete question. I am also interested. >> >> We can "exchange" CPU & RAM to minimize disk i/o. >>> Should we change to dovecot 2.0? >>> Maybe mdbox can help us? >>> Maybe ext4 instead of ext3? >>> >> > Uhm, well, again, depends on your needs. Pop3? Imap? Both? Number of > accounts? Can't really help without more details. Maybe I can't help > with more details either, but that is a risk you take on a mailing list. > > > 1. Is migration to dovecot 2.0 good idea if I want to decrease I/O? >> > > Depends on what version you run now really. But I would recommend it > anyway just on principle. > > > 2. Can mdbox help decrease IO? >> 3. What is better for mdbox or maildir - ext3 or ext4? >> > > Dont' know. But you can certainly tune the FS in either case (atime/dtime, > flush rate, external journal, etc). Some will say XFS is better, etc. > Besides, you can hardly decide the best FS until you know the mailbox > format (mbox, maildir, mdbox, etc). > > If you want concret answers, you need concret questions... > > > -- > Eric Rostetter > The Department of Physics > The University of Texas at Austin > > Go Longhorns! > > -- Kerem Erciyes Sistem Danismani http://proje.keremerciyes.com kerem.erci...@gmail.com +90 532 737 05 83