Sun Microsystems Sun Fire V440 Diagnostics And Troubleshooting Manual page 178

How to Troubleshoot a System That Is
Hanging
Before You Begin
This procedure assumes that the system console is in its default configuration, so
that you are able to switch between the system controller and the system console.
See:
"About Communicating With the System" on page 164
"Access Through the Network Management Port" on page 168
What to Do
1. Verify that the system is hanging.
a. Type the ping command to determine whether there is any network activity.
b. Type the ps -ef command to determine whether any other user sessions are
active or responding.
If another user session is active, use it to review the contents of the
/var/adm/messages file for any indications of the system problem.
c. Try to access the system console through the ALOM system controller.
If you can establish a working system console connection, the problem might not
be a true hang but might instead be a network-related problem. For suspected
network problems, use the ping, rlogin, or telnet commands to reach another
system that is on the same sub-network, hub, or router. If NFS services are served
by the affected system, determine whether NFS activity is present on other
systems.
d. Change the system control keyswitch position while observing the system
console.
For example, turn the keyswitch from the Normal position to the Diagnostics
position, or from the Locked position to the Normal position. If the system
console logs the change of keyswitch position, the system is not fully hung.
160 Sun Fire V440 Server Diagnostics and Troubleshooting Guide • July 2003