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Massive scalability

Has anyone had any experience running OpenLDAP under 64-bit operating systems?

I am planning to run
* OpenLDAP 2.0.23
* Berkeley DB 4.0.14.
* OS: SuSE SLES with the 2.4.17 kernel
* HW: IBM 390

I'm interested in knowing:
1) Does going to a 64-bit increase the performance relative to running under 32-bit?
2) How does going to 64-bit affect the overall number of users that I can store in the directory? (I'm looking in the 10-30 million entry range.)

Any feedback will be greatly appreciated.