Fong Vang wrote: > I have a total of 20 CentOS 4.1 systems running on fairly new > hardware. About 6 of them are experiencing strange hangs without any > indication -- nothing in /var/log/messages nor on the console -- > sometime within 10-30 minutes after a reboot. The systems still > responds to ping but you can't ssh to it. At the console, you could > type "root" at the user prompt but it hangs immediately after hitting > enter. > > Memory scan of all systems show no error. > > Any idea how to troubleshoot this problem. The system's not > responsive to do any troubleshooting and nothing abnormal is in the > log. > > We running htis kernel: kernel-smp-2.6.9-11.EL.i686.rpm. Have you tried disabling hyperthreading? I had suffered this problem when we started buying Intel Xeon's, disabling HT'ing seemed to fix the problem for me. Dean