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Failover with RAID Cards and Multiple HBAs
The BPN-SAS3-846EL backplane may be configured for failover with multiple HBAs
using either RAID controllers or HBAs to acheive failover protection.
RAID Controllers: If RAID controllers are used, then the failover is accomplished
through port failover on the same RAID card.
HBAs: If multiple HBAs are used to achieve failover protection and load balancing,
Linux MPIO software must be installed and correctly configured to perform the load
balancing and failover tasks.
Dual Host Bus Adapter
In a dual host bus configuration, the
backplane connects to two HBAs.
Dual Host Bus Adapter
Failover
If the expander or data path in Port
A fails, the system automatically
switches to Port B. This maintains a
full connection to all drives.
IMPORTANT: For RAID controllers, redundancy is achieved through port failover.
For multiple HBAs MPIO software is required to achieve failover protection.
Appendix B: BPN-SAS3-846EL Backplane Specifications
Q866
J47
EXP I2C4
1
3
J48
1
3
MH13
Q872
EXP I2C0
4
4
2
2
U35
Q873
J29
4
S_SDB
BC29
1
BC10
4
U51
1
JP4
MH17
A
S_MDIO
OVERHEATFAIL1
C
EC2
1
EC3
EC8
L4
4
14
6
C354
L6
U30
EC12
U31
L10
MH18
+
TP36
MH20
EC11
EC10
1
4
PWR4
1
4
1
2
PWR5
3
U33
6
1
4
12
PWR6
MH19
MH21
+12V
GND
+5V
Port B
Expander 2
Figure B-9. Dual HBA
Q866
J47
EXP I2C4
1
3
1
J48
3
EXP I2C0
MH13
Q872
4
4
2
2
U35
Q873
J29
4
S_SDB
BC29
1
BC10
4
U51
1
JP4
MH17
A
S_MDIO
OVERHEATFAIL1
C
EC2
1
EC3
EC8
EC6
L4
4
14
6
C354
L6
U30
EC12
EC9
U31
L10
MH18
+
TP36
J52 J51
MH20
EC11
EC10
1
4
PWR4
1
1
4
2
PWR5
3
U33
6
12
1
4
PWR6
MH19
MH21
+12V
GND
+5V
Port B
Expander 2
Figure B-10 Dual HBA Failover
B-13
SAS HBA
SAS HBA
MH14
Q871
Q870
12V_LED1
C
22
+
BC57
A
Q869
C177
12
C
U29
L9
A
C
A
C
A
C233 C236
U21
EC6
5
5
1
1
A
E
H
U19
A
E
H
EC9
HS2
HS1
1
5
10
20
25
30
TP94
15
MH22
TP95
10
A
PRI
U1
SEC
E
K
R
J52 J51
J50 J49
Y
L3
AE
CS21
AK
BPN-SAS3-846EL2
J52
J51
J50
J49
D1
PRESS FIT
PRESS FIT
CG5
CG2
PRESS FIT
PRESS FIT
D1
H1
D1
H1
D1
D7
H7
D7
H7
D7
H7
D7
H1
D8
H8
D2
D8
H2
H8
D8
H8
D2
D8
CG2
H2
CG2
D2
H2
CG5
D2
G7
CG5
C1
C7
G1
G7
C1
C7
G1
G7
CG2
C1
C7
C1
C7
G1
C2
C8
G8
C2
C8
G2
G8
C2
C8
G8
C2
C8
G2
G2
F7
B7
F7
B1
B7
F7
B1
B7
B1
B7
F1
B1
F1
F1
B2
B8
B2
B8
F2
B2
F2
B2
F2
F8
F8
B8
F8
B8
A1
A7
E7
CG4
CG1
A1
A7
E7
CG4
CG1
A1
A7
E7
CG4
CG1
A1
A7
E1
E1
E1
E2
CG1
A8
A2
A8
E2
E8
A2
A8
E2
E8
A8
A2
E8
A2
MH23
SAS HBA
SAS HBA
MH14
Q871
L7
Q870
12V_LED1
C
22
+
BC57
A
Q869
C177
12
C
U29
A
L9
C
C165 C107
A
C
A
C233 C236
C206
U4
U21
5
5
1
1
A
E
H
U19
A
E
H
HS2
HS1
1
5
10
20
25
30
MH22
TP94
TP15
15
TP95
10
A
PRI
U1
SEC
E
K
R
J50 J49
Y
L3
AE
CS21
AK
BPN-SAS3-846EL2
J52
J51
J50
J49
D1
PRESS FIT
PRESS FIT
CG5
CG2
PRESS FIT
PRESS FIT
D1
H1
D1
H1
D1
D7
H7
D7
H7
D7
H7
D7
H1
H1
D8
H8
D2
D8
H2
H8
D8
H8
D2
D8
H2
CG2
H2
CG2
D2
H2
CG5
D2
G7
CG5
C1
C7
G1
G7
C1
C7
G1
G7
CG2
C1
C7
G1
C1
C7
G1
C2
C8
G8
C2
C8
G2
G8
C2
C8
G8
C2
C8
G2
G2
G2
B1
F7
B7
F7
B1
B7
F7
B1
B7
F1
B7
F1
B1
F1
F1
B2
B8
B2
B8
F2
B2
B8
F2
F8
B2
F2
F2
F8
F8
CG4
B8
A1
A7
E7
CG4
CG1
A1
A7
E7
CG4
CG1
A1
A7
E7
CG1
A1
A7
E1
E1
E1
E1
E2
E2
CG1
A8
A2
A8
E2
E8
A2
A8
E2
E8
A8
A2
E8
A2
MH23
MH15
L7
MH16
LED Testing Only
ACTLED
J30
1
P_UART
L2
1
4
4
Q867
11
1
JP3
1
J31
4
P_MDIO
P_SDB
12
22
U26
C165 C107
C206
U4
EC20
EC18
U3
5
5
C122
1
1
+
A
A
E
E
H
H
11
+
MH26
L5
C76
TP15
+
F73
WWN
22
12
MH24
U28
11
WWN
L8
+
1
4
REV:1.01
DESIGNED IN USA
PWR1
+12V
GND
+5V
H7
H1
H2
H8
1
CG5
G1
G7
4
18
13
19
G2
G8
F7
F1
F2
F8
PWR3
7
PWR2
1
E1
E7
CG4
4
+12V
GND
+5V
+12V
GND
+5V
E2
E8
MH25
MH27
BC96
R65
Port A
Expander 1
MH15
MH16
LED Testing Only
ACTLED
J30
1
P_UART
L2
1
4
4
Q867
11
1
JP3
1
J31
4
P_MDIO
P_SDB
12
22
U26
EC20
EC18
U3
5
5
C122
1
1
+
A
A
E
E
H
H
11
+
MH26
L5
C76
+
F73
WWN
22
12
MH24
U28
11
WWN
L8
+
1
4
REV:1.01
DESIGNED IN USA
PWR1
+12V
GND
+5V
H7
H8
1
CG5
G7
4
18
13
19
G8
F7
F8
PWR3
7
PWR2
1
E7
CG4
4
+12V
GND
+5V
+12V
GND
+5V
E8
MH25
MH27
BC96
R65
Port A
Expander 1
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