[Dovecot] HA Mailbox Design

[rob]

On 08/11/2012 01:18 PM, Stan Hoeppner wrote:
> On 8/11/2012 11:52 AM, Daniel Parthey wrote:
>> Nikolaos Milas wrote:
>>> On 10/8/2012 4:47 πμ, Stan Hoeppner wrote:
>>>
>>>> That begs the question,
>>>> what is your definition of a "Highly Available Mail Server"?  What is it
>>>> that you actually want to accomplish?  In some detail please.
>>> 1. Under normal conditions, mail2.example.com is a full mirror of
>>> mail1.example.com; when any mail message is
>>> added/viewed/moved/removed etc. to any user's folder or any folder
>>> is added/viewed/moved/removed etc. at mail1.example.com, we want it
>>> to be automatically and directly (in real time)
>>> added/viewed/moved/removed etc. to mail2.example.com too. In other
>>> words, we need continuous, real-time sync.
>>>
>>> Can I do this and how?
>> You might have a look at DRBD (distributed replicated block device)
>> which provides a high available block device with fully synchronous
>> mirroring:
>>
>> http://www.drbd.org/home/mirroring
>>
>> Dovecot can then simply work with the filesystem residing on
>> the highly avilable DRBD volume.
> But to be clear, for a true HA setup with full active/active nodes, this
> must be a cluster filesystem (GFS2/OCFS2).
>

A good solution for kvm + drbd is this:  
http://pve.proxmox.com/wiki/Two-Node_High_Availability_Cluster