I have a problem with a development Sun V120 platform. I will come back to it and sporadically find it's back at the ok prompt.

There are no core dumps and I've had a look at /var/adm/messages and this hasn't really helped. Can someone give me some pointers on where else to look, or how to set some better logging up. Unfortunately several people have root access (because it is used for development) so I can't rule out human intervention at the mo.

Cheers
Matt

you can bump up what gets logged to /var/adm/messages by editing /etc/syslog.conf

but that would be your main source to find out who or why the machine rebooted.

that and syslog

Make sure you have a dump device and all that set up correctly. Otherwise it may be crashing and you miss the core files. In solaris check out man dumpadm for more details. Also, make sure there is a /var/crash/hostname directory as that is the default place crash dumps get stored.

You might also look into what your eeprom settings are. If you are losing power (even just a quick temporary outage that isn't notice usually) you could be shutdown and if the parameters are wrong, will stay at the ok prompt.

You can check either by looking while at the ok prompt or get most of the variables at the command line with eeprom. Check that auto-boot?=true

Also check that you are not using power management and the server is turning itself off - see this post

For another possibility, read this.

when you installed the OS did you choose to have 'power save' option.
I've not selected it before but perhaps this is causing your problem.