[Dovecot] Design details of high performance dovecot cluster

[JEHERUL]

Hi Robert,

Thanks for your quick reply. I have already read the document you have
mentioned  but I am unable to come to any decision.

At present we have ext4 file system in our storage. So it is not possible
to use NFS at our present situation. I think we should migrate to GFS2 or
glusterfs. But lots of people in mailing list raising question about the
performance issues of NFS. I am really confused about it.

Can you share some design document for load balancing or clustering ...

Regards

Jeherul


On Fri, Dec 6, 2013 at 4:42 PM, Robert Schetterer <rs at sys4.de> wrote:

> Am 06.12.2013 11:28, schrieb JEHERUL:
> > Dear All,
> >
> > Currently we are running a mail system for 10000 users each 2GB mailbox.
> At
> > present we have 5 mail servers where users mailboxes are distributed
> almost
> > uniformly.
>
> looks enough
>
> We have a HP SAN Storage (HP EVA 6400) where mailboxes are
> > stored. We partition the storage into five vg and each is mounted on the
> 5
> > servers. We are using postfix and dovecot.
> >
> > The system was running fine but currently we  notices high IO load due to
> > IMAP connection. So we are planning to build a dovecot cluster.
>
> ident the io problem on the storage, give more info about  mailbox
> format etc
>
> perhaps read
>
> http://wiki2.dovecot.org/MailLocation/SharedDisk
> http://wiki2.dovecot.org/NFS
>
>
> >
> > Please suggest some design for the dovecot cluster keeping in mind to our
> > scenario. (If needed we can buy additional hardware like load balancer).
>
> you should use loadbalancer, you dont have to buy it , something like
> keepalived etc is enough, however you should use
>
> http://wiki2.dovecot.org/Director with more servers
>
> for an idea with loadbalancers look at
>
>
> http://sys4.de/de/blog/2013/06/10/loadbalancing-mit-keepalived-postfix-dovecot/
>
> ( sorry german only )
>
> >
> > With Thanks and Regards
> >
>
> at last
> you have to give more info like dovecot version , config
> logfiles , general setup
>
>
>
>
> Best Regards
> MfG Robert Schetterer
>
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-- 
Jeherul Islam
Scientific Officer
Computer Centre
Indian Institute of Technology Guwahati
Guwahati-39
India
Office No :+91-361-258-3353