[Dovecot] Performance-Tuning

[Peer Heinlein]

Hi,

I have > 11 TB hard used Mailstorage, saved als maildir in ext3 on HP EVA.

I always wanted to make some mesurements about several influences to the 
performance (switch to ext4, switch to mdbox), but I never had enough time 
to do that.

At the moment I *need* more speed, we have too much waitI/O on the system 
and I already used all other performance and tuning-tricks (separated cache, 
noatime, fsync and all that stuff).

I have to change my setup, maybe somebody else here have hard facts:

*) Is ext4 faster? How much faster? 
*) Is it faster because of the ext4 kernel-module (which can be used on ext3 
to) or because of the ext4 filesystem layout?


*) Is mdbox really faster? I'd like to have mdbox to have better performance 
in running my backup-processes. But does it bring some performance boosts 
to? 


Thanks for any hints an tricks,

Peer


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