5.4 - it's actually CentOS, not RedHat, but they should be equivalent.
Dave
-----Original Message-----
From: Research Computing Support [mailto:[log in to unmask]] On Behalf Of Downes, Lawrence
Sent: Tuesday, December 13, 2011 8:22 AM
To: [log in to unmask]
Subject: What version of O/S on the redhawk cluster?
Docs only say "RedHat" no versions?
thanks
Larry