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Modifying existing schema definition without reimporting data ?

Hello, 

is it possible to change Schema definitions on openldap servers without
recreating the backend ? 

Background: We have a ldap server (or multiple replicated LDAP servers)
and have a certain attribute in the schema defitnion that is currently
defined as "single value". It's the MAC address for clients used for
X802.1 auth. The attribute is part oif the user object used for logins.
Now it's possible, that users have multiple MAC addresses. We want to
add multiple MAC addresses to that list, so we must chnage the attribute
type from single to multiple values (sorry, I don't know the exact name
of the defintion statement). 

Would this be possible by doing the following: 

stop ldap slave server 
change schema defintion for MAC address attribute from single to
multivalue
Start ldap slave again

stop ldap master  
change schema defintion for MAC address attribute from single to
multivalue
Start ldap master 

Is changing the schema definion generally possible for changes other
then singlevalue->multivalue - e.g. add another attribute or modify
other things ? 

Looking forward to any feedback, 
Robert Heinzmann

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