Chapter 1
| Switch Description
Data Center Deployment
– 14 –
Figure 4: Converged Ethernet Data Center Deployment
Rack Cooling The top-of-rack switch is a high-performance, high-density unit that generates a
substantial amount of heat. When mounted in a rack with other equipment, it is
important that the switch has the same airflow direction to avoid “hot loops” in the
data center ailses. Hot loops increase cooling requirements since warm air is drawn
into rack devices instead of cool air.
Most rack-mounted blade servers draw cool air from the front and expel hot air at
the rear. The top-of-rack switch includes two fan trays that have a front-to-back
(F2B) airflow direction that maintains cool ailses in the data center.
Figure 5: F2B Airflow Cooling
FCoE Storage
Servers Servers
ToR Switch ToR Switch
Core Switch
Core Switch
Conso
l
e
Res
e
t
Clear
Mo
d
e
Se
lect
Ac
t
F
dx
100
Sw
it
c
h
E
n
g
in
e
F
a
il
S
e
l
f
T
e
s
t
A
1X
L
i
nk
M
o
d
e
2X
3X
4X
5X
7X
6X
8X
A
1X
L
in
k
Mod
e
2X
3X
4X
5X
7X
6X
8X
A
1X
Li
n
k
M
o
de
2X
3X
4X
5X
7X
6X
8X
A
1X
L
in
k
Mod
e
2X
3X
4X
5X
7X
6X
8X
Sta
tu
s
A
I
E
C
1
G
B
J
F
D
2
H
Modules
Po
w
er
Fan
A
1X
L
i
nk
Mode
2X
3X
4X
5X
7X
6X
8X
A
1X
L
in
k
M
od
e
2X
3X
4X
5X
7X
6X
8X
A
1X
Lin
k
Mo
d
e
2X
3X
4X
5X
7X
6X
8X
A
1X
Link
Mo
d
e
2X
3X
4X
5X
7X
6X
8X
A
1X
L
in
k
Mod
e
2X
3X
4X
5X
7X
6X
8X
A
1X
Link
Mode
2X
3X
4X
5X
7X
6X
8X
Conso
l
e
Reset
C
l
ea
r
Mo
d
e
Se
lect
Act
Fdx
100
Sw
it
ch
E
n
g
in
e
F
a
il
Se
l
f
T
e
s
t
A
1X
L
i
nk
M
o
d
e
2X
3
X
4X
5X
7X
6
X
8X
A
1X
L
i
nk
Mod
e
2X
3
X
4
X
5X
7X
6
X
8X
A
1X
Li
n
k
M
o
de
2X
3
X
4X
5X
7X
6
X
8X
A
1
X
Link
Mod
e
2
X
3X
4
X
5
X
7
X
6X
8
X
S
t
a
tu
s
A
I
E
C
1
G
B
J
F
D
2
H
Modules
Power
Fan
A
1X
Link
Mode
2X
3
X
4
X
5X
7X
6
X
8X
A
1X
L
i
nk
Mod
e
2X
3
X
4
X
5X
7X
6
X
8X
A
1X
L
in
k
Mod
e
2X
3
X
4
X
5X
7X
6
X
8X
A
1X
L
in
k
Mod
e
2X
3
X
4
X
5X
7X
6
X
8X
A
1X
L
i
nk
Mod
e
2X
3
X
4
X
5X
7X
6
X
8X
A
1
X
Link
Mode
2
X
3X
4X
5
X
7
X
6X
8
X
Front of Rack
Rear of Rack
Cool Aisle
Hot Aisle
Servers
ToR Switch