[Dovecot] Hardware infrastructure for email system

[Wojciech Puchar]

> ALT storage, so for instance you could keep your indexes in a RAID10 of SSDs, 
> recent email on a RAID10 of 10kRPM/15kRPM SAS drives, and older email can go 
> on a load of 5k/7.2k SATA drives in RAID6, or on a NAS via NFS.

far better solution but still about 2-3 times more $/performance than 
needed, and more complex than needed.

But at least an improvement