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Failover with RAID Cards and Multiple HBAs
The BPN-SAS3-836EL 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.
MH1
MH13
S_ICE_HDR
SEC-J4
J37
2
20
EC16
CG3
CG1
SEC_J3
1
19
EC19
L12
CG2
L10
SEC-J3
SEC_J2
CG3
CG1
CG2
MH2
EC15
EC17
SEC-J2
CG3
CG1
BAR CODE
SEC_J1
CG2
HS1
CG3
AF
CG1
AE
SEC-J1
Y
EC13
EC14
R
SEC_J0
CG2
S_HB_LED
S_SDB
K
A
C
J36
1
4
J35
4
Y2
S_UART
1
E
A
26
25
20
15
10
5
1
4
H
E
A
H
E
A
1
4
1
PWR3
PWR4
1
1
2
5
5
J29
MH3
MH12
U48
9
1
S_MDIO
1 2
3
Port B
Expander 2
MH1
MH13
S_ICE_HDR
J37
2
20
SEC-J4
EC16
CG3
CG1
SEC_J3
1
19
EC19
L12
CG2
L10
SEC-J3
SEC_J2
CG3
CG1
CG2
MH2
EC15
EC17
SEC-J2
CG3
CG1
BAR CODE
SEC_J1
CG2
HS1
CG3
AF
CG1
AE
SEC-J1
Y
EC13
EC14
R
SEC_J0
CG2
S_HB_LED
S_SDB
K
A
C
J36
1
4
J35
Y2
S_UART
1
4
E
A
26
25
20
15
10
5
1
4
H
E
A
H
E
A
1
4
1
PWR4
PWR3
1
1
2
5
5
J29
MH3
MH12
U48
9
1
S_MDIO
1 2
3
Port B
Expander 2
C-51
Appendix C Backplane Specifications
SAS HBA
SAS HBA
MH5
P_SDB
ACTLED1
1
J24
1
J19
P_UART
P_HB_LED
L2
4
D21
1
4
A
C
EC20
EC1
EC2
L7
2
4
SMB
1
3
J17
A
C
SECONDARY EXPANDER
2
EC3
EC4
J28
4
1
2
20
1
3
PRI_I2C1
P_ICE_HDR
WWN
MH7
L6
1
C21
26
25
EC12
EC11
20
U1
15
PWR2
10
H
E
A
H
E
A
5
1
1
LT3
5
5
1
4
1
PWR1
A
E
K
U8
10
1
J34
S_JTAG
8
P_MDIO
2
9
MH9
J27
1
1
4
J18
1
10
P_JTAG
Figure 3EL-8. Dual HBA
SAS HBA
SAS HBA
MH5
P_SDB
ACTLED1
1
J24
1
J19
P_UART
P_HB_LED
L2
4
D21
1
4
A
C
EC20
EC1
EC2
L7
2
4
SMB
1
3
A
J17
C
SECONDARY EXPANDER
2
EC3
EC4
J28
4
1
2
20
1
3
PRI_I2C1
P_ICE_HDR
WWN
MH7
L6
1
C21
26
25
EC12
EC11
20
U1
15
PWR2
10
H
E
A
H
E
A
5
1
1
LT3
5
5
1
4
1
PWR1
A
E
K
U8
10
1
J34
S_JTAG
8
P_MDIO
2
9
MH9
J27
1
1
4
J18
1
P_JTAG
Figure 3EL-9. Dual HBA Failover
MH6
MH4
1 2 3
A
C A
C
L4
5V_LED1
12V_LED1
EC10
EC9
BPN-SAS3-836EL2
PRI-J4
REV 1.01
CG3
CG1
DESIGNED IN USA
L5
L3
PRI-J3
PRI_J3
CG2
P_MDIO
CG3
CG1
EC7
EC8
WWN
MH8
PRI_J2
CG2
MH11
PRI-J2
HS2
CG3
CG1
PRI_J1
PRI-J1
CG2
CG1
CG3
LT4
R
Y
AE
AF
PRI_J0
CG2
MH10
EC6
EC5
L1
Y1
Port A
Expander 1
MH6
MH4
1 2 3
A
C A
C
L4
5V_LED1
12V_LED1
BPN-SAS3-836EL2
EC10
EC9
PRI-J4
REV 1.01
CG3
CG1
DESIGNED IN USA
L5
L3
PRI-J3
PRI_J3
CG2
P_MDIO
CG3
CG1
EC7
EC8
WWN
MH8
PRI_J2
CG2
MH11
PRI-J2
HS2
CG3
CG1
PRI_J1
PRI-J1
CG2
CG1
CG3
LT4
R
Y
AE
AF
PRI_J0
CG2
MH10
EC6
EC5
L1
Y1
10
Port A
Expander 1
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