Re: [Dovecot] Load Balancing and HA

We tried one time software solution, not very reliable under load, we move to coyotepoint equalizer hardware load balancer, very good cost and excellent reliable

On Wed, May 29, 2013 at 7:23 AM, Romer Ventura <rventura@h-st.com> wrote:

Hello,

I've been thinking about the best way to achieve load balancing and making my mail servers highly available. So far I believe I have 2 scenarios:

Scenario1: This should allow any to lose any of the servers and clients still have access to their emails (although I am not sure how the indexes would react to this and sudden disconnection)

•      2 Dovecot Proxy servers, using a virtual IP to where the clients

  will connect to from the WAN and LAN

•      2 Dovecot+Postfix servers with local cache

•      2 NFS servers and synced with dsync (mirror, 1 server writes to

  its own NFS and changes synced to the other via dsync)

Scenario2: Pretty much as above on the back end. However, with this there is no way to load balance users.

•      2 Dovecot+Postfix server with local cache

•      2 NFS servers synced with dsync

•      Make use of DNS MX record priority to provide access to

  secondary email server

Anyone care to comment?

Thanks.

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