Monitoring the system using the command line

When logged into the system though a terminal session, you can use the following commands to check the status of specified components or areas.

ap
Reports system state
ap info
Shows general information about the system, such as serial number, MTMs, and customer details
ap hw
Lists hardware inventory with status of each component
ap node
Lists, enables and disables nodes
ap sw
Lists software inventory with status of each component
ap issues
Lists all open alerts (issues) and unacknowledged events
ap fs
Lists all filesystems, mounts, NDSs and their states

You can learn more of these commands in ap commands.