[Dovecot] nfs and pop3

[Marten Lehmann]

Hi,

I'm working with dovecot 1.0.beta2 for pop3 only and have set 
index=memory, so no indizes are created on the disk. pop3_uidl_format is 
set to %f. The maildirs are located on an nfs-share.
So generally, this setup is very similar to what qmail-popup and 
qmail-pop3d does. However, everytime I'm switching from qmail-pop3d to 
dovecot, the system load increases from less than 2 to more than 30 (and 
later up to 60 and more). The problem is I/O, probably caused by 
nfs-access. But what is causing this accesses? qmail-pop3d just takes 
filenames as UIDL, and moves the mails from new to cur, reads them to 
send them to the client or deletes them. This is working fine.
But what is dovecot doing? There must be a lot more things that cause 
that high I/O load. Indizes are disabled, so they cannot be the cause 
any longer.
Any ideas? I just want to switch to dovecot at some point finally 
without having qmail-pop3d as backup.

Regards
Marten