Hey everyone,
Currently where I work we use qmail. Every time a message is delivered,
qmail seems to walk through the user's entire maildir in order to
calculate quota usage. Delivering messages simultaneously to just a few
users who are allowed large maildirs (1-2GB) will bring our servers to
their knees. Which brings me to dovecot. I use dovecot whereever I can,
but haven't yet needed to set up quotas. I would like to migrate my
servers at work to use dovecot, but have a few questions regarding
quotas. Could someone explain how dovecot calculates quota usage on mail
delivery? Also, is there anyone here on the list that uses quoatas on
large maildirs (>=2GB)? How well has it worked for you?
thanks,
Scott
On Monday, June 25 at 10:10 AM, quoth Scott Zahn:> Currently where I work we use qmail. Every time a message is > delivered, qmail seems to walk through the user's entire maildir in > order to calculate quota usage.Qmail doesn't support quota calculations. The quota calculation you describe must be being performed by some add-on to qmail (such as vpopmail's vdelivermail. If it's not doing a good job, you may want to look into using a different add-on. ~Kyle -- Disobedience, in the eyes of any one who has read history, is man's original virtue. It is through disobedience that progress has been made, through disobedience and through rebellion. -- Oscar Wilde -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 196 bytes Desc: not available URL: <http://dovecot.org/pipermail/dovecot/attachments/20070625/bfed574b/attachment-0002.bin>
Hello, On Mon, 25 Jun 2007 10:10:00 -0400 (EDT) "Scott Zahn" <scott at zahna.com> wrote:> Currently where I work we use qmail.My condolences. The worlds most patched PoS (software, really, I mean software) by the biggest ego in the business.> Every time a message is > delivered, qmail seems to walk through the user's entire maildir in > order to calculate quota usage.That doesn't seem right, not if it is using maildirsize maildir++ quotas, see: http://www.inter7.com/courierimap/README.maildirquota.html The worst case scenario would be a full mailbox, which would trigger a full recalculation every 15 minutes (Exim does it every 20 minutes). This recalculation is part of the specification, of course a smartly designed mail system will (with a few scripts and a database of sorts) prevent delivery attempts (and thus recalcs) to full mailboxes. So the first thing to check is if these mailboxes are perma-full or if they get so much activity that the maildirsize quickly grows to the 5k size that triggers a recalculation. If neither is the case, then yes, qmail is your enemy (surprise, surprise). Or if you are delivering with something else, that is the culprit then.> Delivering messages simultaneously to > just a few users who are allowed large maildirs (1-2GB) will bring our > servers to their knees. Which brings me to dovecot. I use dovecot > whereever I can, but haven't yet needed to set up quotas. I would like > to migrate my servers at work to use dovecot, but have a few questions > regarding quotas. Could someone explain how dovecot calculates quota > usage on mail delivery? Also, is there anyone here on the list that > uses quoatas on large maildirs (>=2GB)? How well has it worked for you? >Again, having to recalculate the quota eventually is part of the specification. If your hardware (I/O) can stand the infrequent recalculations working maildir++ quota requires you are gold. Regards, Christian -- Christian Balzer Network/Systems Engineer NOC chibi at gol.com Global OnLine Japan/Fusion Network Services http://www.gol.com/
On Mon, June 25, 2007 10:26, Kyle Wheeler wrote:> On Monday, June 25 at 10:10 AM, quoth Scott Zahn: >> Currently where I work we use qmail. Every time a message is >> delivered, qmail seems to walk through the user's entire maildir in >> order to calculate quota usage. > > Qmail doesn't support quota calculations. The quota calculation you > describe must be being performed by some add-on to qmail (such as > vpopmail's vdelivermail. If it's not doing a good job, you may want to > look into using a different add-on. > > ~KyleAh. I didn't realize this. I haven't been using qmail long and I'm not a fan. Thanks for this enlightening bit of information. -Scott