Sun Microsystems Enterprise 250 Owner's Manual page 264

Disk LEDs
The disk LEDs are visible from the front of the system when the bottom door is
open, as shown in the following figure.
LEDs
When a disk LED lights steadily and is green, it indicates that the slot is populated
and that the drive is receiving power. When an LED is green and blinking, it
indicates that there is activity on the disk. Some applications may use the LED to
indicate a fault on the disk drive. In this case, the LED changes color to yellow and
remains lit. The disk drive LEDs retain their state even when the system is
powered off.
Error Messages
Error messages and other system messages are saved in the file
/var/adm/messages.
The two firmware-based diagnostic tools, POST and OBDiag, provide error
messages either locally on the system console or remotely on an RSC console. These
error messages can help to further refine your problem diagnosis. The amount of
error information displayed in diagnostic messages is determined by the value of the
OpenBoot PROM variable diag-verbosity. See "OBDiag Configuration Variables"
on page 225 for additional details.
246 Sun Enterprise 250 Server Owner's Guide • June 1998