Example 2. Broken Loop (Cable Removed):

Each disk drive module normally

 

 

 

communicates with the adapter through

one data path. Because data can p

around

the

loop

in either

direction,

however,

the

adapter

automatically

r

the loop to enable communication to continue

to each

disk

drive

if

the

lo

broken.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In

the

following

diagram,

eight disk

drive

modules

should

be

connected

to

A1

and A2 of the SSA adapter. However,

the

loop

is

broken because

the

has

been

disconnected

from

connector

A2.

Four

disk

drive

modules

are

conne

to

connectors B1

and

B2

of

the same SSA

 

adapter.

 

 

 

 

 

 

Although the broken loop is reported as an error, all the disk drive modu communicate with the using system. The eight disk drive modules can communic through connector A1 of the SSA adapter . The five disk drive modules can nicate through connectors B1 and B2 of the same SSA adapter (normal loop).

7-50RS/6000 Enterprise Server Model H Series User's Guide

Page 210
Image 210
IBM RS/6000 manual Example 2. Broken Loop Cable Removed