openLDAP with Aix

hello

I have a P570 with 3 partitions.
These partitions are available, since 1 year. So there are a lot of users, files, etc, on these partition
I must now install an openldap with Debian to manage all these users.
But several pb:
on LDAP, we are 1 iud for user and one home directory, 1 gid for group. And these uniq setting is the same for all partitions.....
And actually, i have a user X with the id 12 on partition 1, id 54 on partition 2 and ID 321 on partition 3, with home directory different on each partition !!!!!!! you understand the problem !!!!!!!
I can't destroy all to recreate with openldap, because i have 800 users on each partitions, and 6 To of files !!!!!
If i must modify permission and group of all files for all new user ID, it is a very dangerous and big work !!!!!!
perhaps there is a tool for ldap to make the interface between the openldap and these different partition, but i don't know........
so if you have a solution.......:smiley: !
thank you