Thanks folks, I have collated some responses below to make it easier to read: Cyrus on Solaris at Universities: Carnegie-Mellon University University of California Davis 50K accounts (active), multiple T2000 failover clusters ZFS storage to arrays attached through SAN Univ California Santa Barbara ?50K? accounts, Single V480 University of North Carolina 75K users, single Sun 6800 w/48G RAM, 10 TB storage Duke University 50K users, SunFire 1280 University of Konstanz, Germany Brussels Free Universities, Belgium 52K users, single Cyrus server, 1.5 TB University of Bradford, UK 25K users, single V480, 2 TB Insitut Eurecom, Sophia-Antipolis France 1.1K users, Sun Cluster 3.1, 0.5 TB Graz University of Technology, Austria V480 & V280, Sol 9, 3 TB -> replacing w 2 x4600 University of Tampere, Finland 20K users, 0.9 TB ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html