dovecot pre-install issue

[soumitri at iitk.ac.in]

Hi,

Thanks for the information. But still not sure about which dovecot 
version to choose. Any more help from developers/gurus can be a help. I 
am open to dovecot enterprise release, if it can satisfy my queries.

Regarding dovecot director, I am presently planning for option1, you 
have mentioned.

1) 200,000 IOPS (my next 5 years requirement) is possible with NFS, as 
claimed by EMC, Netapp; and I am planning to go for it. I am not in 
favour of NFS with dovecot, but out existing setup is based on NFS and 
migration will be easy. I am open for any improved storage solution 
instead of NFS.

2) I guess, the partitioning of users requires a careful planning due to 
different quota demand. presently I am trying to avoid this.

Any help in choosing appropriate dovecot version is appreciated.

Soumitri Mishra
http://home.iitk.ac.in/~soumitri/


> Hi,
>
> I understand your concerns about new versions and bug fixing, but 
> after running this system for more than 3 year, trying to keep up to 
> date all the time… needed a rest. That why we moved to the “out of the 
> box” version, and let’s see. And it works.
>
> About the director. There is 2 ways to use it:
>
> 1. you have multiple front end for some NFS or other single storage, 
> it should balance the load between them. I tried it, but EMC, NetApp 
> or other wouldn’t handle the IO/s, and that’s where there must be some 
> limitations in remote FS (mainly on indexing).
>
> 2. you spread your users between 2 or more storage machines (that’s 
> what we do, 12 of them currently) that each run dovecot. You can 
> define in you DB the IP where your user’s mail is stored, and the 
> director will redirect whatever protocol (IMAP. POP3, LMPT, Sieve) to 
> the machine where the user belong. When we did the move from NFS to 
> that solution, the load on all the servers were reduce by at least 50 
> to 60%… if not more. And it allowed us to move from 7 webmail/pop3 
> front end to 2, and 5 MXs to 2,  using 2.2.10 from CentOS 7.
>
> About the new features… well it does look good. But 2.2.10 still allow 
> you to run remote doveadm commands, so not ready to move yet. Even 
> though I do like it, but so much to do, and so little time to do it...
>
> Regards,
>
>
>
>
>
>