[...]
PS: During the first search, the disk is heavy used (iotop) by writing
from slapd.conf ... why it - should only read ...?
This does not make sense. slapd should not *write* to slapd.conf.
You should probably learn how to use strace to find out what really
happens on your system. You should also install the same LDAP database
and the same config on another physical server to see whether it behaves
equally there. If you can present proof that slapd is indeed writing to
slapd.conf, you should probably file an ITS.
Good luck with your troubleshooting,
--
Bjørn
