Digital Equipment AlphaServer 2000, Owner'S Manual

Page: 150 / 196

Interpreting the Operator Control Panel Power-Up Display
Interpreting the Operator Control Panel Power-Up Display
Table 4–7 describes how to interpret messages that may be
displayed on the power-up display located on the operator control
panel on the front of the system (Figure 2–1).
CPU Failover AlphaServer 2000 systems offer high-availability ‘‘failover’’
functionality. If your system has more than one CPU, the
failover feature allows the system to power up and boot the
operating system even if only one CPU is working.
How Failover Works
During either a power-up or system reset, the serial ROM
tests check for a good CPU starting with CPU0, to serve as the
primary CPU. The primary CPU is the only CPU that tests
memory and reads the flash ROM code.
If a CPU fails serial ROM tests, or if the CPU has an error
logged to its serial control bus EEPROM, that CPU is disabled.
The lowest numbered passing CPU serves as the primary CPU.
If all CPU modules fail their power-up diagnostics, then CPU0
serves as the primary CPU.
Note
The CPU number of the CPU serving as the primary
CPU is displayed in the SRM console prompt; for
example,
P01>>>
.
4–12 Troubleshooting the System