[Dovecot] the most serius problems [part 1]

[Farkas Levente]

what's more we plan to centralize two more companies mailbox (about 
50+200 mailbox) so we need a system which able to handle about 500 
mailbox and about 200 concurrent users.

Mark E. Mallett wrote:
> On Wed, May 28, 2003 at 01:46:33PM +0200, Farkas Levente wrote:
> 
>>the first on is the load.
>>has anybody else use dovecot in a real enviromnt with at least hundreds 
>>of users and at least 50 concurrent user at the same time?
>>it seems to me no one else just me.
> 
> 
> That seems like an awfully high percentage of users connecting- if I
> assume "hundreds" might mean 300, 1 out of every 6 users is connected
> at any given time?
> 
> One of the servers running dovecot here has thousands of users.  During
> the middle of the day I typically see 17-20 users connected at any
> given time.  This has been known to increase to 50+ especially during
> prime time (evening).  Over a period of 24 hours dovecot logins occur
> at the rate of around 2.5 logins per second.  Now- most of our users
> are using POP rather than IMAP, but there is still a reasonable amount
> of IMAP activity.  Plus I'm not sure that detail matters: POP logins
> use resources too, perhaps repeated POP logins use more than
> constantly-connected imap sessions.
> 
> The load on the server due to dovecot is negligable.  Most of the load
> is due to handling incoming mail.  Obviously you are seeing something
> different- perhaps you are using features that we are not.
> 
> I rather wish dovecot would log some more statistics, as I think has
> been mentioned already- like a record for logout as well as one for
> login, including number of messages scanned, left on server,
> downloaded, and deleted, plus total bytes transferred).  These numbers
> would give a better picture of what's going on.
> 
> -mm-
> 


-- 
   Levente                               "Si vis pacem para bellum!"