Rack 1
Rack 2
C
C
C
C
C
C
C
C
C
C
C
C
C
C
I
C
I
Rack 3
Rack 4
C
C
C
C
C
C
C
C
C
C
C
C
C
C
R
R
R
R
C
I
C
I
R
R
R
R
C
Independent system:
has its own CPUs, memory
and I/O capabilities
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