Hello all, I am going for a dovecot director based setup (2 director+ 2 imap), more imap servers will be added later depending on demand/load. Presently I have 12000+ dovecot users with Maildir quota varying from 1 GB to 20GB. (peak hour IOPS 50000+) I am having 2 options in choosing dovecot version. 1) Old stable release. I.e RHEL, with prebuilt binary. This will be having less trouble in managing. Why RHEL still using version 2.2.10. 2) Latest release with best features and lesser known bugs. I.e CentOS7 with with latest compiled version. I have to be more involved if a bug is found. I will prefer a less admin work after the setup, with all/most features working. If you have a recent similar setup/dovecot gurus, Pl. suggest. With thanks & regards, -- Soumitri Mishra http://home.iitk.ac.in/~soumitri/
> On 16 Nov 2016, at 11:06, soumitri at iitk.ac.in wrote: > > Hello all, > > I am going for a dovecot director based setup (2 director+ 2 imap), more imap servers will be added later depending on demand/load. Presently I have 12000+ dovecot users with Maildir quota varying from 1 GB to 20GB. (peak hour IOPS 50000+) > > I am having 2 options in choosing dovecot version. > > 1) Old stable release. I.e RHEL, with prebuilt binary. This will be having less trouble in managing. Why RHEL still using version 2.2.10. > > 2) Latest release with best features and lesser known bugs. I.e CentOS7 with with latest compiled version. I have to be more involved if a bug is found. > > I will prefer a less admin work after the setup, with all/most features working. > > If you have a recent similar setup/dovecot gurus, Pl. suggest. > > With thanks & regards, > > -- > > Soumitri Mishra > http://home.iitk.ac.in/~soumitri/Hi, Running since about 6 month a new setup with 2 directors and 12 IMAP/POP3/LMTP/Sieve servers for mail storage (Maildir), to handle 500K+ users, all straight of CentOS 7 (good old yum and dovecot 2.2.10). It works very well, install is straight forward, event though it needs a bit of optimisation for this kind of traffic. Each user is assigned an IP for the redirection, which dovecot handles very well. And the deployment of new storage machine can be done in less than 30mn. I didn?t have any problem with bugs up to now. But knowing that most access is done via a webmail interface (Roundcube) or POP3, we are not confronted with specific clients and IMAP problems you see now and then. Hope this help. Regards, Thierry
Hi, Thanks for the reply. I guess RHEL choose v2.2.10 <http://dovecot.org/list/dovecot-news/2013-December/000268.html> as it is a good release with all the things working. My source of confusion are from 1) http://dovecot.org/oldnews.html I have gone through each release update news. Lots of work and bug fix after v2.2.10 <http://dovecot.org/list/dovecot-news/2013-December/000268.html>, got me confused. E.g. in v2.2.13 has a fix " copied below" <http://dovecot.org/releases/2.2/dovecot-2.2.13.tar.gz> director was somewhat broken when there were exactly two directors in the ring. It caused errors about "weak users" getting stuck. 2) http://wiki2.dovecot.org/Design/DoveadmProtocol/HTTP An interesting feature to explore post setup. With thanks & regards, Soumitri Mishra http://home.iitk.ac.in/~soumitri/ On Wednesday 16 November 2016 04:31 PM, Thierry de Montaudry wrote:>> On 16 Nov 2016, at 11:06, soumitri at iitk.ac.in wrote: >> >> Hello all, >> >> I am going for a dovecot director based setup (2 director+ 2 imap), more imap servers will be added later depending on demand/load. Presently I have 12000+ dovecot users with Maildir quota varying from 1 GB to 20GB. (peak hour IOPS 50000+) >> >> I am having 2 options in choosing dovecot version. >> >> 1) Old stable release. I.e RHEL, with prebuilt binary. This will be having less trouble in managing. Why RHEL still using version 2.2.10. >> >> 2) Latest release with best features and lesser known bugs. I.e CentOS7 with with latest compiled version. I have to be more involved if a bug is found. >> >> I will prefer a less admin work after the setup, with all/most features working. >> >> If you have a recent similar setup/dovecot gurus, Pl. suggest. >> >> With thanks & regards, >> >> -- >> >> Soumitri Mishra >> http://home.iitk.ac.in/~soumitri/ > Hi, > > Running since about 6 month a new setup with 2 directors and 12 IMAP/POP3/LMTP/Sieve servers for mail storage (Maildir), to handle 500K+ users, all straight of CentOS 7 (good old yum and dovecot 2.2.10). It works very well, install is straight forward, event though it needs a bit of optimisation for this kind of traffic. Each user is assigned an IP for the redirection, which dovecot handles very well. And the deployment of new storage machine can be done in less than 30mn. > I didn?t have any problem with bugs up to now. But knowing that most access is done via a webmail interface (Roundcube) or POP3, we are not confronted with specific clients and IMAP problems you see now and then. > > Hope this help. Regards, > > Thierry > >
On 11/16/2016 01:06 AM, soumitri at iitk.ac.in wrote:> Hello all, > > I am going for a dovecot director based setup (2 director+ 2 imap), more > imap servers will be added later depending on demand/load. Presently I > have 12000+ dovecot users with Maildir quota varying from 1 GB to 20GB. > (peak hour IOPS 50000+) > > I am having 2 options in choosing dovecot version. > > 1) Old stable release. I.e RHEL, with prebuilt binary. This will be > having less trouble in managing. Why RHEL still using version 2.2.10. > > 2) Latest release with best features and lesser known bugs. I.e CentOS7 > with with latest compiled version. I have to be more involved if a bug > is found. > > I will prefer a less admin work after the setup, with all/most features > working. > > If you have a recent similar setup/dovecot gurus, Pl. suggest. > > With thanks & regards, >I only run small server but I use CentOS and build the most recent myself and do not have many issues. CentOS 7 dovecot btw is same as RHEL 7 dovecot as far as I know.