Oui les groupes dynamiques utilisent plus de ressources que les autres types de groupe, mais sur les serveurs HUB, ils font appelles à une mise en cache par Exchange des objets de type récipients de 4h.
Ils sont donc recalculés toutes les 4h
par les serveurs HUB.
"Transport rules and group membership
When you define a Transport rule using a predicate that expands membership of a distribution group, the resulting list of recipients is cached by the Transport service on the Mailbox server that applies the rule. This is known as the Expanded Groups Cache
and is also used by the Journaling agent for evaluating group membership for journal rules. By default, the Expanded Groups Cache stores group membership for four hours.
Recipients returned by the recipient filter of a dynamic distribution group are also stored. The Expanded Groups Cache makes repeated round-trips to Active Directory and the resulting network traffic from resolving group memberships unnecessary."
Source:
http://technet.microsoft.com/en-us/library/dd351127(v=exchg.150).aspx
Bruce Jourdain de Coutance - Consultant Exchange http://brucejdc.blog.free.fr
