I have an oracle cluster management and noticed that when Oracle evict a node (Sun Solaris 10 server); it does cause a reboot that looks like a power outage (reference to http://www.unix.com/sun-solaris/104605-3320-disk-array-configuration-oracle-10-a-3.html\) that is not logged in the messages log. After further investigation, it was found out that Oracle is issuing "/sbin/uadmin 1 1". The man page for uadmin is not very useful so I checked the internet and found out that "uadmin 1 1" means do not sync filesystems and reboots to multi-user mode. I have tested "uadmin 1 1" and "uadmin 2 1" (which means sync the filesystems and reboots to multi-user mode) and noticed that when in both cases the messages log does not show who issued the command (like what you see when you issue "reboot")! In the case of "uadmin 2 1" the last thing the messages log shows is "syncing file systems..." and then nothing until the server comes back up.
I have contacted Sun and the support claimed that when uadmin is issued it should be logged in the messages log but after some time of discussion he agreed that the messages log do not log it but does not know why.
Anybody know more details on this command, what is the different between it and "reboot" and why it is behaving like this if this is the proper behavior?
I have already considerable amount of time searching so any response is might be helpful and appreciated.