El 23/11/12 08:07, Timo Sirainen escribió:
On 16.11.2012, at 12.11, Angel L. Mateo wrote:

        We are deploying shared mailboxes in our mail system. We are running 
2.1.9 and mail backend is maildir.

        As described at http://wiki.dovecot.org/SharedMailboxes/Shared when 
shared namespace is configured as

namespace shared {
  separator = /
  prefix = shared/%%u/
  location = maildir:%%h/Maildir:INDEX=~/Maildir/shared/%%u
  subscriptions = no
  list = children
}

        each user accessing this folder has its own index, stored in 
~/Maildir/shared/%%u/<shared mailbox>, hasn't it?

Right.

        Our mail is store in NFS disks so we are very concerned about indexes 
optimizations (we had performance problems until we got all of our indexes and 
nfs tunned). So, is there any way so those indexes could be shared for all 
users (and they always would be updated).

If you don't need per-user flags you can just remove the per-user INDEX. If you 
want per-user flags and want to share indexes, you need the new INDEXPVT option 
that exists in v2.2 or as a patch to v2.1: 
http://dovecot.org/patches/2.1/private-index.diff

        Regarding this... if we'd use dbox instead of maildir, indexes are a 
really important part of the mailbox and they can't be re-constructed when they 
are outdated. So, how do shared mailboxes work with dbox backend? Do I have to 
configure indexes in any particular way?

INDEXPVT is a requirement with dbox if you want per-user flags.

BTW. Do you have multiple Dovecot backend servers? Director works only when 
you're not using shared mailboxes..

Oh... sad to read this. I have multiple backend server behind a director one.

--
Angel L. Mateo Martínez
Sección de Telemática
Área de Tecnologías de la Información
y las Comunicaciones Aplicadas (ATICA)
http://www.um.es/atica
Tfo: 868889150
Fax: 868888337

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