[Dovecot] Hardware infrastructure for email system

[Reindl Harald]

Am 23.06.2012 13:09, schrieb Wojciech Puchar:
>>
>> I'm currently (re-)planning my email setup and have been doing some research. I have done some searches and read
>> several threads in the areas of my questions here. While there are some that come close I haven't yet been able
>> to get all my questions answered.
>>
>> I currently run a postfix, dovecot & roundcube setup and have about 2000 active accounts. I have a separate SMTP
>> server for outbound mail and auth is done against a separate LDAP server. In front of the POP/IMAP server I have
>> another SMTP (4 in parallel actually) server that receives and filters inbound mail through a company specific,
>> proprietary filter before the mail hits the POP/IMAP server. LDAP & SMTP servers are ESXi VMs.
> 
> it is already enormous overshoot in hardware specs. And i do not really catch why you have "4 in parallel" servers.
> And finally i cannot understand this dividing of servers just to merging it back using VMWare.

because it is a big difference if you have anything in a single
machine or splittet in virtual machines - you can move them at
runtime to different hosts and if you run out of ressources
for one of them you can buy a phyisclal machine, add it to the
cluster and move the virtual machine without any downtime

if you have all on one machine or VM you are not scaleable

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