On Apr 18, 2015, at 8:00 AM, David Gessel wrote:

> 
> 
> -------- Original Message --------
> Subject: Re: Dovecot 2.2.16: disappearing messages, mismatched summaries, 
> duplicated messages, excessive full re-downloads
> From: Timo Sirainen <[email protected]>
> To: David Gessel <[email protected]>
> Date: Sat Apr 18 2015 15:48:28 GMT+0300 (Arabic Standard Time)
> 
>> No. My best guess is that (your) ZFS+FreeBSD is simply not behaving the way 
>> Dovecot wants filesystems to behave (readdir() sometimes skipping over 
>> files). I don't have any other suggestion than trying a different filesystem 
>> or OS. I haven't heard ZFS having these problems before though.
> 
> 
> Or migrating to sdbox.  Absent any further suggestions, that will be my next 
> step.  My commitment to Maildir is far lower than my commitment to 
> FreeBSD/ZFS.  It is just a historical preference coming from a decade+ of 
> courier IMAP. 



What is the output for:

# zpool status

perhaps you have a hardware issue?

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