Sun Microsystems SPARCserver 1000 Service Manual page 43

Control Area Actions
OpenBoot The boot program runs additional
tests such as the disk drive tests.
The program boots the system by
loading the operating system from the
root disk drive. The root disk is
usually drive number 0 in the internal
SCSI disk drive tray.
Operating The operating system loads into
system memory and begins running.
(UNIX) If a hardware failure occurs while the
system is running, POST can
automatically configure around the
failure, and reboot.
2.2 Status Lights and Indicators
Table 2-1 Hardware and Software Control of the System (Continued)
Observations
To read OBP messages, connect
the console (serial ASCII
terminal) to the system master.
If the console connects to the
wrong system board, messages
will NOT appear on the screen.
If set to verbose mode,
OpenBoot displays a list of
system hardware options.
All system boards; the left two
green LEDs denote that 0, 1, or
2 SPARC modules are installed
and functional.
Figure 2-1 shows the location of indicators on the system front panel.
Troubleshooting Overview
2
Indicators
System board LEDs:
• system master (slot 0); the
eight lower (yellow) LEDs
cycle constantly
• all others; the yellow LEDs
remain on (do not cycle)
• any system board; if the
yellow LEDs are off, the
board has failed POST
System board LEDs:
• all boards; the eight lower
(yellow) LEDs cycle
constantly, except those
having no SPARC modules
2-3