[Dovecot] Questions regarding dbox migration

[Charles Marcus]

On 10/14/2009 12:24 PM, Timo Sirainen wrote:
>>> BTW. Have you tried maildir_very_dirty_syncs=yes setting? That should
>>> reduce disk i/o, and I'm really interested in hearing how much.

>> What are the downsides? Also, I'm guessing maybe there are certain
>> conditions where you definitely don't want to do it?

> The only reason you wouldn't want to set it is if cur/ directory is
> modified outside Dovecot. Or Dovecot is used without index files (or
> e.g. with NFS and local index files). The point being: Dovecot trusts
> index files to be up-to-date with cur/ directory's contents.
> 
> Although even then it still checks the cur/'s mtime to see if it had
> changed. The only problem is if Dovecot changes it at the same time as
> non-Dovecot. Then it doesn't know that there was a change. Unless the
> filesystem supports nano/microsecond mtimes, that'll make it very
> unlikely for Dovecot to miss this.

Perfect explanation, thanks. :)