I don't know what kind of filesystem is currently being used, but I'm guessing it's probably UFS, although it could also be mounting the data via NFS. I'd seriously consider ZFS, if I thought there was a good chance that there might be a performance or reliability win.
Using NFS with OpenLDAP is not supported. So I hope not.
--Quanah
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Quanah Gibson-Mount Principal Software Engineer Zimbra, Inc -------------------- Zimbra :: the leader in open source messaging and collaboration