Glance is a very good tol if you can keep an eye on the display.
If you don't have glance, or prefer background monitoring, look at "sar" (system activity reporting).
Take care directory /var/adm/sa exists, or create it if it doesn't exist, and then run for instance "/usr/lbin/sa/sa1 600 144".
This will log a general system activity report 144 times , every 600 seconds (10 minutes), so in total 24 hours.
You will find a file in directory /var/adm/sa that you can query with a command like "sar -f saxx [-option]"
Look at the sar manpage for the available options. You can query about everything.