Yes it is ok now ! backup is samesize and phpldapadmin show all entry
I think the source of problem could be i started in root users...and not ldap + schema
just onething obscur ... : to sync the schema i copied the schema : rfc822-MailMember.schema
from my master server and i don't know if it is a good solution...
In what package this schema is ? may be it is better to install package of this schema ?
It seems to be ok now !!!!!