--On Monday, April 08, 2013 8:31 PM -0600 Leo Mocofan lm5@ualberta.ca wrote:

I noticed something similar on ubuntu10 as well.  I upgraded my server to ubuntu12, and I also set /proc/sys/vm/dirty_ratio to 90 and /proc/sys/vm/dirty_expire_centisecs to 60000, and that helped significantly with back-mdb using current OpenLDAP master.  An ldapadd of almost 3.5 million users takes approximately 4 hours now for my dataset vs 16.  so 4x faster.

Thank you for your suggestions. I tried these two settings and ldapadd wrote 3 GB in 8 hours (out of 4.3 GB). How big is your database ?

My DB is 5.6GB in size after load is complete.

--Quanah

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Quanah Gibson-Mount Sr. Member of Technical Staff Zimbra, Inc A Division of VMware, Inc. -------------------- Zimbra :: the leader in open source messaging and collaboration