Does OpenLDAP cache writes?

["fuser9bb@hotpop.com" <fuser9bb@hotpop.com>]

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.

Thanks!