TroubleshootingOverview 9-7
9
9.3 Basic Definitions for the Card Cage

When locating a board slot in the 8-slot and 16-slot card cages, remember:

9.4 Diagnosing Problems

When boardLED codes indicate a hardware problem, several types of software

programs are available to supply information about the problem.

9.4.1 Error Messages

Error messages and other system messages are saved in the file

/var/adm/messages.

Slot numbers Even-numbered slots areat the front of the card cage. Odd-
numbered slots areat the back.
In the frontof the card cage, even-numbered slots begin with slot
0 at the top. At the rear of the cardcage, odd-numbered slots
begin with slot 1 at the top.
Installthe boards with component side down in the front slots and
with component side up in the rear slots.
For specific slot numbers, see AppendixB, “Functional
Description.”
Slot functions Allcard cage slots are equivalent. However, for convenience in
installing I/O cables, it is suggested that you install
CPU/Memory boards at the front of the cage andinstall I/O
boards at the back of the cage. When all slots arefilled on one
side of the cage, you can use the other side.
Slot 1 should contain an I/O board connected to the boot disk.
(This is not a requirement.)
Slot0 should contain a CPU/master board with at least one CPU.
The POST diagnostics display more messages if slot 0 contains a
CPU/Memoryboard and a CPU. For an explanation, see the next
item, “Master board.”
Master board Thereis no master board during normal system operations. The
first CPU/Memory board(in slot 0) functions temporarily as a
master board during some POST tests.