Supermicro SC826 JBOD User Manual page 83

B-10 Failover
The BPN-SAS3-826EL2 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.
Appendix B BPN-SAS3-826EL Backplane Specifications
7
J23 SEC-J4
MH8
MH4 + 1 4 24
+ SEC-UART
C496 C497
SEC-SDB
J19
1 4
SEC-J3
U27
SECONDARY EXPANDER
C5
C499
U6
+
SEC-J2
U17
JPW3
C52
MH5
U21
C500
SEC-J1
C681
+
C689
L22
U20
JPW2
JPW1 U14 L23
Port B
Expander 2
Figure B-7. Single HBA
J23
MH8
SEC-J4
MH4 + 1 4
+ SEC-UART
C496 C497
SEC-SDB
J19
1 4
U27
SEC-J3
C5
U6
+
U17
SEC-J2
JPW3
C52
MH5
U21
C681
C689
SEC-J1 L22
U20
JPW2
JPW1 U14 L23
Port B
Expander 2
Figure B-8. Single HBA Failover
B-11
SAS HBA
LED28 HB-LED
I2C#4 I2C#0 DESIGNED IN USA
J20
J21 U30
U22
BPN-SAS3-826EL1
MH9
U34
4 SAS CODE
3 2 1
4 3 2 1 REV:1.00
C501 +
C495
ACT-LED
C494
+ TEST
J17 1
JP1 +
U16
MH3
U24
+ C491
+
J16
L3
BAR CODE
SAS HBA
LED28 HB-LED
7 I2C#4 I2C#0 DESIGNED IN USA
J20
J21 U30
U22
BPN-SAS3-826EL1
24 MH9
U34
4 SAS CODE
3 2 1 4 3 2 1
REV:1.00
C501 +
C495
ACT-LED
SECONDARY EXPANDER C494
+ TEST
J17 1
JP1 +
U16
MH3
C499
U24
+ C491
C500
+
J16
+
L3
BAR CODE
PRI-J4
PRI-SDB
LED29 A C + C502
J18 R97 A C C A
1 4 LED25 LED26
12V 5V
MH1 MH7
MH6 1 4
PRI-UART
J22
SAS CODE
U7
PRI-J3
C492 C498 J*
+ J15
+
PRIMARY EXPANDER
PRI-J2
1
MH2 J14
PRI-J1 J*
3
2
1
Port A
Expander 1
PRI-SDB C502
LED29 A C +
PRI-J4 J18 R97 A C C A
1 4 LED25 LED26
12V 5V
MH1 MH7
MH6 1 4
PRI-UART
J22
SAS CODE
U7
PRI-J3
C492 C498 J*
+
J15
+
PRIMARY EXPANDER
PRI-J2
1
MH2 J14
J*
PRI-J1
3
2
1
Port A
Expander 1