IBM RS/6000 manual Disk, Adapter t, Loop, Cables Provide, Light

The SSA links must be				configured	as loops. The loop is connected			to	the int
connectors	at	the	SSA adapter		card. Thesemustconnectorsbe a	valid	pair	(that		is,
A1 and A2, or B1				and B2); otherwise, the disk drive modules				on	the	loop
configured,	and the			diagnostics fail. Operations to all the disk drive mod
particular	loop	can		continue if	that loop breaks at	any	one point.

Each pair of connectors has a green light that indicates the operational related loop:

Status	of	Light	Meaning
Off			Both	SSA	connectors		are inactive. If disk drive modules are connected t
			these	connectors,			either those modules are failing, or their SSA links hav
			been	enabled.
Steady		on	Both	SSA	links	are	active (normal operating condition).
Slow	Flash		Only one		SSA link	is	active.

Disk

Drive

Module Strings

In the system unit, the disk

drive

modules

are arranged in

a

string of

modules. This string has its own

two

SSA

connectors. This

string

is

connected

through

an

internal

SSA cable

to

a

pair

of

connectors

on the

SSA

adapter t

an

SSA

loop. (The

SSA

cables

provide

the

SSA

links.)

The following diagram shows the

relationships between the SSA connectors and

disk

drive

module

string in

a

system

unit.

7-26RS/6000 Enterprise Server Model H Series User's Guide