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Does OpenLDAP cache writes?

We are running openldap2-2.2.6-37.22 on SuSE 9.1 Pro on a Dell. Since getting this server we have had the system freeze a few times (looking into hardware issues right now). The freezes required that we hard reset the server. When this happens we seem to lose edits to our LDAP directory from the last week or so. (We have a few new account entries, and a few password changes--this directory is used for mail routing.)

Does slapd do any kind of long-term caching? I would think that anything more than an hour or two old will have been written to disk and should be okay. Yet, it seems that a reboot always causes recent changes to be lost, but older data to stay around.

I'm not sure what could be causing this and am wondering if anyone has any ideas.

And yes, we are working on the freezing issue, and the lost data and lock-ups are probably directly related, but I'm just curious if slapd is doing any caching that I can disable to ensure this doesn't happen again if the system locks up again.