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...luster (see previous mail), they all follow the same pattern, a user who accesses their mailbox with both POP3 and IMAP deletes mails with POP3 and the IMAP (imap-hibernate really) is getting confused and upset about this: --- Apr 6 09:55:49 mbx11 dovecot: imap-login: Login: user=<redacted at gol.com>, method=PLAIN, rip=xxx.xxx.x.46, lip=xxx.xxx.x.113, mpid=951561, secured, session=<2jBV+HRM1Pbc9w8u> Apr 6 10:01:06 mbx11 dovecot: pop3-login: Login: user=<redacted at gol.com>, method=PLAIN, rip=xxx.xxx.x.46, lip=xxx.xxx.x.41, mpid=35447, secured, session=<uZw7C3VM9vfc9w8u&...

...rn, a user who accesses their mailbox > > with both POP3 and IMAP deletes mails with POP3 and the IMAP > > (imap-hibernate really) is getting confused and upset about this: > > > > --- > > > > Apr 6 09:55:49 mbx11 dovecot: imap-login: Login: user=<redacted at gol.com>, method=PLAIN, rip=xxx.xxx.x.46, lip=xxx.xxx.x.113, mpid=951561, secured, session=<2jBV+HRM1Pbc9w8u> > > Apr 6 10:01:06 mbx11 dovecot: pop3-login: Login: user=<redacted at gol.com>, method=PLAIN, rip=xxx.xxx.x.46, lip=xxx.xxx.x.41, mpid=35447, secured, session=<uZw7C3V...

...vers? If so, how many IMAP sessions can one proxy server handle (assuming the proxy does authorization using MySQL running on a separate server)? And, could the proxy server be tuned to help in optimizing mostly IDLE backend sessions? > On Feb 12, 2017, at 1:58 AM, Christian Balzer <chibi at gol.com> wrote: > > > Hello, > > On Fri, 10 Feb 2017 14:50:03 -0500 KT Walrus wrote: > >>> 1. 256GB of real RAM, swap is for chums. >> >> Are you sure that 100,000 IMAP sessions wouldn?t work well with SWAP, especially with fast SSD storage (which is a l...

...l times. My mail server isn?t that large yet as I haven?t fully deployed Dovecot outside my own small group yet, but it would be nice if scaling Dovecot IMAP to millions of users wasn?t limited to 50,000 IMAP sessions on a server... > On Feb 10, 2017, at 11:07 AM, Christian Balzer <chibi at gol.com> wrote: > > On Fri, 10 Feb 2017 07:59:52 -0500 KT Walrus wrote: > >>> 1500 IMAP sessions will eat up about 3GB alone. >> >> Are you saying that Dovecot needs 2MB of physical memory per IMAP session? >> > That depends on the IMAP session, read the...

...th both POP3 and IMAP deletes mails with POP3 and the IMAP > > > > (imap-hibernate really) is getting confused and upset about this: > > > > > > > > --- > > > > > > > > Apr 6 09:55:49 mbx11 dovecot: imap-login: Login: user=<redacted at gol.com>, method=PLAIN, rip=xxx.xxx.x.46, lip=xxx.xxx.x.113, mpid=951561, secured, session=<2jBV+HRM1Pbc9w8u> > > > > Apr 6 10:01:06 mbx11 dovecot: pop3-login: Login: user=<redacted at gol.com>, method=PLAIN, rip=xxx.xxx.x.46, lip=xxx.xxx.x.41, mpid=35447, secured, session=&...

...id10 give a faster write and read whereas Raid 1 will have slow writes and fast reads the question is will there be huge performance difference between Raid1 and Raid 10 when it comes small files like mail queue ? thanks rajesh ----- Original Message ----- From: Christian Balzer [mailto:chibi at gol.com] To: dovecot at dovecot.org Cc: kevin at my.walr.us Sent: Mon, 13 Feb 2017 10:46:13 +0900 Subject: Hello, On Sun, 12 Feb 2017 08:27:21 -0500 KT Walrus wrote: > Thanks for the info. I do have one further question for you. On your servers that are currently handling 50k IMAP sessions, how...

...ing so while also fitting all 2.7GB of data for about 1 million users into RAM. ############## >>>>>>>>>>>>>>>>>>how do i put all relevant data into the RAM ? thanks rajesh ----- Original Message ----- From: Christian Balzer [mailto:chibi at gol.com] To: dovecot at dovecot.org Sent: Tue, 14 Feb 2017 16:40:01 +0900 Subject: Hello, On Mon, 13 Feb 2017 22:53:23 +0530 Rajesh M wrote: > thanks for your help > > happy to say that the performance dramatically improved after i use the high performance settings from here > http://...

...mailbox > > > with both POP3 and IMAP deletes mails with POP3 and the IMAP > > > (imap-hibernate really) is getting confused and upset about this: > > > > > > --- > > > > > > Apr 6 09:55:49 mbx11 dovecot: imap-login: Login: user=<redacted at gol.com>, method=PLAIN, rip=xxx.xxx.x.46, lip=xxx.xxx.x.113, mpid=951561, secured, session=<2jBV+HRM1Pbc9w8u> > > > Apr 6 10:01:06 mbx11 dovecot: pop3-login: Login: user=<redacted at gol.com>, method=PLAIN, rip=xxx.xxx.x.46, lip=xxx.xxx.x.41, mpid=35447, secured, session=<uZ...

...ions will eat up about 3GB alone. Are you saying that Dovecot needs 2MB of physical memory per IMAP session? If I want to support a max 100,000 IMAP sessions per server, I should configure the server to have at least 200GBs of SWAP? > On Feb 10, 2017, at 3:58 AM, Christian Balzer <chibi at gol.com> wrote: > > On Fri, 10 Feb 2017 01:13:20 +0530 Rajesh M wrote: > >> hello >> >> could somebody with experience let me know the dovecot config file settings to handle around 1500 simultaneous connections over pop3 and 1500 connection over imap simultaneously. &gt...

...they all follow the same pattern, a user who accesses their mailbox > with both POP3 and IMAP deletes mails with POP3 and the IMAP > (imap-hibernate really) is getting confused and upset about this: > > --- > > Apr 6 09:55:49 mbx11 dovecot: imap-login: Login: user=<redacted at gol.com>, method=PLAIN, rip=xxx.xxx.x.46, lip=xxx.xxx.x.113, mpid=951561, secured, session=<2jBV+HRM1Pbc9w8u> > Apr 6 10:01:06 mbx11 dovecot: pop3-login: Login: user=<redacted at gol.com>, method=PLAIN, rip=xxx.xxx.x.46, lip=xxx.xxx.x.41, mpid=35447, secured, session=<uZw7C3VM9vfc...

Hello, I've just finished transiting our proxies from perdition to dovecot (2.1.7-7 Debian). Yesterday 12 messages (all within the same second) like this caught my attention: --- Apr 25 17:19:09 pp11 dovecot: auth: Warning: proxy(redacted at gol.com,xx.xx.xx.xx,<26hUEivbfQBlMrMS>): DNS lookup for mb04.dentaku.gol.com took 5.002 s --- Now this machine at that time was handling a load of about 2 logins per second, about 20% of what it previously handled with perdition w/o a hiccup. It also runs a local caching nameserver and the A rec...

...dovecot.org/list/dovecot/2016-November/106284.html ) Timo mentioned that he's not aware of anybody doing more than 50k per server, something I got licked already and definitely will go to 100k eventually. Regards, Christian > > On Feb 10, 2017, at 11:07 AM, Christian Balzer <chibi at gol.com> wrote: > > > > On Fri, 10 Feb 2017 07:59:52 -0500 KT Walrus wrote: > > > >>> 1500 IMAP sessions will eat up about 3GB alone. > >> > >> Are you saying that Dovecot needs 2MB of physical memory per IMAP session? > >> > &g...

...here have been migrated to the new mail system with dovecot 0.99.10.5 (Debian package) on the backends. Storage is maildir, only pop3 access for now. I see very seldom occurrences (compared to the session wide pop lock of qpopper on the old system) like this: --- Jun 16 14:35:52 mb01 pop3(user at gol.com): Timeout while waiting for release of exclusive fcntl() lock for index file /mail/spool/mb01/9ef/f73/af.user/.INBOX/.imap.index --- These are people with slow connections and at least one large mail in the box, with their client aborting w/o terminating the session properly. I presume the t...

Hi, I've very old Dovecot version so I'm trying to migrate new disk and current version of dovecot. But POP3 accounts have "version 1" .INBOX/dovecot-uidlist files so clients download the messages again. How can achieve not to download to mailbox after copy to new disk? Is there any script or something to migrate index v1 to v3? thanks for your suggestions.

...rucial for us as we need this for our custom mailbox migration functionality. If there's no workaround or fix within 2 months I'll be forced to disable hibernation again (with a heavy heart). Regards, Christian -- Christian Balzer Network/Systems Engineer chibi at gol.com Global OnLine Japan/Rakuten Communications http://www.gol.com/

...g their obviously flawed cleanup on exit. Some things clearly do NOT scale well. My current goal is to have 100k capable servers that work well, 200k in a failover scenario, but that won't be particular enjoyable. Christian > > On Feb 10, 2017, at 3:58 AM, Christian Balzer <chibi at gol.com> wrote: > > > > On Fri, 10 Feb 2017 01:13:20 +0530 Rajesh M wrote: > > > >> hello > >> > >> could somebody with experience let me know the dovecot config file settings to handle around 1500 simultaneous connections over pop3 and 1500 connecti...

...and spread out sessions between hibernate processes? It's clearly something more involved than "fill up one and then fill up the next" or we would see 16k on the old one and a few on the new one. Christian -- Christian Balzer Network/Systems Engineer chibi at gol.com Global OnLine Japan/Rakuten Communications http://www.gol.com/

...Dovecot's logic between a mail service that has a service count of 1 versus one with >1? 2. Any way to get the process recycling for IMAP going w/o setting the fd limit to a ridiculous amount? Thanks, Christian -- Christian Balzer Network/Systems Engineer chibi at gol.com Global OnLine Japan/Rakuten Communications http://www.gol.com/

...ot-auth --- So, I guess my questions to Timo are: Think it's leaky and any idea where? Given the load, would a single auth process be a bad idea? (it is a quite fast dual opteron box) Regards, Christian Balzer -- Christian Balzer Network/Systems Engineer NOC chibi at gol.com Global OnLine Japan/Fusion Network Services http://www.gol.com/

On 6 Apr 2017, at 9.56, Christian Balzer <chibi at gol.com> wrote: > >> For no particular reason besides wanting to start conservatively, we've got >> client_limit set to 50 on the hibernate procs (with 1100 total hibernated >> connections on the box I'm looking at). At only a little over a meg each, >> I'm fi...