I reported a bug like this on 23rd Dec last year and Timo replied 8/1 this year. However, I've seen this bug very infrequently and I'm not sure that you're hitting it - it's more likely that your ulimit -n is too low - try setting it to around 8192 (defaults to 1024 I think). It should be around 3* max conns you expect to be on the safe side of things.
Mark -- Mark Zealey -- Shared Hosting Team Leader Product Development * Webfusion 123-reg.co.uk, webfusion.co.uk, donhost.co.uk, supanames.co.uk This mail is subject to http://www.gxn.net/disclaimer > -----Original Message----- > From: [email protected] > [mailto:[email protected]] > On Behalf Of Jake Grimmett > Sent: 06 February 2009 15:15 > To: [email protected] > Subject: [Dovecot] help: "dovecot: pipe() failed: Too many open files" > > Dear All, > > I'm having an intermittent problem, with dovecot slowing to a crawl. > Restarting dovecot fixes the problem. > > Looking at the maillog, I see loads of these errors.... > > dovecot: pipe() failed: Too many open files > dovecot: Temporary failure in creating login processes, > slowing down for now > dovecot: Created login processes successfully, unstalling > > looking at the processes, I can see ~200 imap-login's and > about ~700 imap's > there are 1000 email accounts on the server - half of which > are in regular > use. > > The server is Dell PE1950 running dovecot (1.0.7-2.el5) as > supplied with > Centos 5.2 (~Redhat AS 5.2) in 64 bit mode. I've upgraded the > server from 4 > to 8GB of RAM, and from a dual core 1.5Ghz xeon, to a quad > core 1.5GHz xeon, > and this does not seem to help. > > The following settings were increased by me to try and stop > this problem - but > did not have an obvious effect: > > login_process_size = 128 > login_process_per_connection = yes > login_max_processes_count = 512 > > Other parameters were left commented out: > > #max_mail_processes = 1024 > #auth_process_size = 256 > > > If anyone has any ideas about where I might be going wrong, > please let me > know..! > > many thanks > > Jake > > -- > Dr Jake Grimmett > Head Of Scientific Computing > MRC Laboratory of Molecular Biology > Hills Road, Cambridge, CB2 0QH, UK. > Phone 01223 402219 > Mobile 0776 9886539 >
