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8-4 AlphaServer GS80/160/320 User’s Guide
8.2 System Control Manager Overview
With the SCM, you can monitor and control the system (reset, power
on/off, halt) without using the operating system. You can enter SCM
commands at a local or remote console device. You also manage hard
partitions using the SCM.
The SCM:
• Controls the control panel display and writes status messages on the
display.
• Detects conditions that require alerts, such as excessive temperature, fan
failure, and power supply failure. On detection, SCM displays messages on
the OCP, pages an operator, and sends an interrupt to the SRM, which then
passes the interrupt to the operating system or an application.
• Retrieves and passes information about a system shutdown to the SRM
console at the next power-up. SRM displays a message regarding the last
shutdown.
• Provides a command-line interface (CLI) for the user to control the system.
From the CLI the user can power the system on and off, halt or reset the
system, and monitor the system environment.
• Passes error log information to shared RAM so that this information can be
accessed by the system.
• Handles power supply hot swap.
• Manages hard partitions using HP_* environment variables.
• Shared RAM on every standard I/O module in the system is kept coherent
by the master SCM. This allows every SCM console and copy of the
operating system in a hard-partitioned system to see the same configuration
information.