[Dovecot] Dovecot Director and MasterUsers

[Daniel Parthey]

Hi,

the Dovecot Director determines the backend host in some way by hashing the username:

http://wiki2.dovecot.org/Director

For normal logins username at example.org, the director always gets the same hash
for the same username and ensures that the login is always proxied to the same backend.

But what about MasterUsers in combination with Dovecot Director?

http://wiki2.dovecot.org/Authentication/MasterUsers

Which configuration directives should be used to make sure that logins

username at example.org*masteruser1 at example.org
username at example.org*masteruser2 at example.org
username at example.org*masteruser3 at example.org

go to the same mailbox backend, in order to avoid NFS caching
conflicts for mailbox username at example.org which should always
reside on the same NFS client?

Is the master user cut off from behind the master_user_separator?
How is the director hash exactly calculated?
Can the director hashing algorithm be configured in some way?

Regards
Daniel