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SC846X Chassis Manual
E-9
Failover
The BPN-SAS3-846EL2 model backplane has two expanders which enable effective
failover and recovery.
Single Host Bus Adapter
In a single host bus configuration, the backplane connects to one host bus adapter.
Single Host Bus Adapter Failover
If the expander or data path in Port A fails, the system automatically switches to
Port B with application software or failover support.
SAS HBA
J47
Q866
EXP I2C4
1
3
1
J48
3
Q872
EXP I2C0
MH13
Q871
4
4
2
U35
2
Q873
J29
4
S_SDB
BC29
4
1
BC10
U51
1
MH17
JP4
A
S_MDIO
OVERHEATFAIL1
C
EC2
1
EC3
EC8
EC6
L4
4
14
6
C354
L6
U30
EC12
EC9
U31
L10
MH18
+
SEC
TP36
J52 J51
MH20
L3
EC11
EC10
1
4
PWR4
1
1
4
2
PWR5
J52
PRESS FIT
D1
3
D7
U33
D8
H1
CG2
H2
D2
C1
C7
G1
C2
C8
G2
6
B1
B7
1
4
12
B8
F1
B2
F2
A1
A7
E1
PWR6
A8
E2
CG1
MH19
A2
MH21
+12V
GND
+5V
Port B
Expander 2
Figure E-7. Single HBA
SAS HBA
J47
Q866
EXP I2C4
1
3
1
J48
Q872
3
EXP I2C0
MH13
4
4
U35
2
2
Q873
J29
S_SDB
4
BC29
4
1
BC10
U51
1
JP4
MH17
A
S_MDIO
OVERHEATFAIL1
C
EC2
1
EC3
EC8
L4
4
14
6
C354
L6
EC12
U30
L10
U31
MH18
+
TP36
MH20
EC11
EC10
1
4
PWR4
1
1
4
PWR5
2
3
U33
6
12
1
4
PWR6
MH19
MH21
+12V
GND
+5V
Port B
Expander 2
Figure E-8. Single HBA Failover
E-10
MH14
MH15
L7
Q870
12V_LED1
22
C
+
BC57
A
Q869
C177
11
12
C
U29
L9
A
C
12
22
C165 C107
U26
A
C
A
C233 C236
U21
C206
U4
U3
5
5
5
5
1
1
1
1
A
E
H
A
E
H
A
A
E
E
H
H
U19
HS2
HS1
TP94
TP15
1
5
10
15
20
25
30
MH22
TP95
10
A
U1
E
PRI
K
R
MH24
Y
J50 J49
CS21
AE
AK
BPN-SAS3-846EL2
REV:1.01
DESIGNED IN USA
J51
J50
J49
PRESS FIT
D1
CG5
CG2
D1
PRESS FIT
PRESS FIT
H7
D7
H1
H7
D7
H1
H7
D1
D7
H7
D8
H8
H1
H8
D2
H2
D2
D8
H2
H8
D2
D8
H2
H8
G7
CG5
CG2
C7
G7
C7
G7
CG5
CG2
C7
G7
CG5
C1
G1
C1
G1
C1
G1
C2
C2
G2
G8
C8
G2
G8
C2
C8
G2
G8
C8
G8
F7
B7
F7
B1
B7
B1
F1
B7
F1
F7
B1
F1
F7
B2
F8
B2
B8
F2
F8
B8
F2
F8
B2
B8
F2
F8
CG4
CG1
A1
CG4
CG1
A1
E7
CG4
CG1
A1
E1
CG4
E7
A7
E1
E7
A7
E1
A7
E7
A8
E2
A8
E2
A8
E2
E8
A2
E8
A2
E8
A2
E8
MH25
MH23
Port A
Expander 1
MH14
Q871
Q870
12V_LED1
C
22
+
BC57
Q869
C177
A
12
C
U29
A
L9
C
A
C
A
C233 C236
U21
EC6
5
5
1
1
A
E
H
U19
A
E
H
EC9
HS2
HS1
TP94
1
5
10
15
20
25
30
MH22
TP95
10
A
U1
PRI
SEC
E
K
R
J52 J51
Y
J50 J49
L3
CS21
AE
AK
BPN-SAS3-846EL2
J52
J51
J50
J49
D1
PRESS FIT
PRESS FIT
CG5
CG2
PRESS FIT
PRESS FIT
D7
H7
D1
D7
H1
H7
D1
D7
H1
H7
D1
D7
H1
CG2
D8
H2
H8
D2
D8
H2
H8
D2
D8
H8
D2
D8
D2
CG5
CG2
C7
G7
H2
G7
CG5
CG2
C7
C1
C7
G7
C1
G1
C1
C7
G1
C1
G1
C2
C8
G2
G8
C2
C8
G2
G8
C2
C8
G2
G8
C2
C8
B1
B7
F7
B1
B7
F1
F7
B1
B7
F1
F7
B1
B7
B8
F1
B2
F8
B2
B8
F2
F8
B2
B8
F2
F8
B2
B8
F2
CG4
CG1
A1
CG4
CG1
A1
CG4
CG1
A1
A7
E7
A7
E1
E7
A7
E1
E7
A1
A7
E1
E2
E2
E2
CG1
A8
E8
A2
A8
E8
A2
A8
E8
A2
A8
A2
MH23
Expander 1
LED Testing Only
MH16
ACTLED
J30
P_UART
L2
1
1
4
4
Q867
1
4
JP3
1
J31
P_MDIO
P_SDB
EC20
EC18
C122
+
11
MH26
+
L5
C76
+
F73
WWN
22
12
U28
11
WWN
L8
+
1
4
PWR1
+12V
GND
+5V
1
4
19
18
13
PWR3
PWR2
7
1
4
+12V
GND
+5V
+12V
GND
+5V
MH27
BC96
R65
MH15
L7
LED Testing Only
MH16
ACTLED
J30
L2
1
P_UART
1
4
4
Q867
1
11
JP3
1
J31
4
P_MDIO
P_SDB
12
22
C165 C107
U26
C206
U4
EC20
EC18
U3
5
5
C122
1
1
+
A
A
E
E
H
H
11
MH26
+
L5
TP15
C76
+
F73
WWN
22
12
MH24
U28
11
WWN
L8
+
1
4
REV:1.01
PWR1
DESIGNED IN USA
+12V
GND
+5V
H7
H1
1
H2
H8
G7
CG5
G1
4
19
18
13
G2
G8
F1
F7
F2
F8
PWR2
PWR3
7
E1
CG4
1
4
E7
+12V
GND
+5V
+12V
GND
+5V
E2
E8
MH25
MH27
BC96
R65
Port A
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