samba - Feb 2006 - samba 3 schema update and reindex ldap databases

We are considering to update our Samba 3.0.5 PDC to 3.0.21 using 
samba-3.0.21b-1.i386.rpm, and rpm -Uvh --test works.  Whe have openldap 
2.3.11 as passwd backend with samba.schema taken from samba-3.0.14 but 
reading the docs (Samba-3 to Samba-3 Updates on the Same Server) it 
states: "it is necessary only to update the LDAP schema".

How the LDAP schema updated and the ldap databases reindex have to be 
done?  I mean, the ldap databases reindex is done at rpm -Uvh time or must 
it be done copying the new samba.schema to the openldap server?

(We don't use winbind and we have all our users under ldap user suffix and 
our computers under ldap machine suffix, so our concers is only that).

If the samba update fails (e.g. if the PDC clients can't authenticate), 
would we need to restore the ldap databases to downgrade? or only samba?

Thanks in advance,

Pablo Chamorro C.

p.s. de documentation page: 
http://www.samba.org/samba/docs/man/Samba-Guide/upgrades.html#id2568616

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