[Dovecot] Unbreakable NFS locking issues...

Rod Treweek rtreweek at gmail.com
Thu Nov 20 04:15:41 EET 2008

Hi Timo,

Thanks Timo.  This is great.  I followed your instructions, and sure enough,
everything is working as expected now.  Thank you very very much.  One
question I have,  What's the advantage of using prefetch?  Is this a
considerable performance benefit, or is it just more or less another way to
do things?  Thanks again.


On Wed, Nov 19, 2008 at 4:54 PM, Timo Sirainen <tss at iki.fi> wrote:

> On Nov 19, 2008, at 9:01 PM, Rod Treweek wrote:
>  password_query = SELECT username as user, password,
>> concat('/NFS1MAILDIR/mailSysV2/',
>> maildir) as userdb_home, concat('maildir:/NFS1MAILDIR/mailSysV2/',maildir,
>> ':INDEX=/usr/local/dovecot/indexes/',maildir) as userdb_mail, 143 AS
>> userdb_uid, 143 AS userdb_gid, concat('*:storage=', floor(quota*1024)) AS
>> quota_rule FROM mailbox WHERE username = '%u' AND active = '1'
> The userdb_* fields here are used only if you're using prefetch userdb.
>  user_query = SELECT concat('/NFS1MAILDIR/mailSysV2/', maildir) as home,
>> concat('maildir:/NFS1MAILDIR/mailSysV2/', maildir) as mail,
>> concat('maildir:/NFS1MAILDIR/mailSysV2/',maildir,
>> ':INDEX=/usr/local/dovecot/indexes/',maildir) as mail_location,
> "mail_location" field is ignored. It's called mail, which you're also
> returning without the :INDEX.
> So I guess you're 1) not using prefetch userdb so the userdb_mail in
> password_query doesn't get used and 2) the "mail" field without :INDEX is
> used from user_query.
>  I've got mail working more or less, however the indexes simply will not
>> appear in the path referenced above. My suspicion has been that this is
>> where my nfs locking problems are occurring, as  the indexes are just not
>> getting populated.  Any ideas?  I gather that the  cacheing done through
>> the
>> mysql database is desirable as it would tend to speed things up quite a
>> bit....any ideas on how to pass the index location through the string as
>> well? Or is this generally regarded as a negligible gain?
> What caching? I'm not really sure what you're asking here.

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